OPINION

IKUTA, Circuit Judge:

I

This appeal raises the question whether two of San Francisco's firearm and ammunition regulations, which limit but do not destroy Second Amendment rights, are constitutional. We conclude that both regulations withstand constitutional scrutiny, and affirm the district court's denial of Jackson's motion for preliminary injunction.

II

San Francisco Police Code section 4512 provides that "[n]o person shall keep a handgun within a residence owned or controlled by that person unless" (1) "the handgun is stored in a locked container or disabled with a trigger lock that has been approved by the California Department of Justice," or (2) "[t]he handgun is carried on the person of an individual over the age of 18."1 S.F., Cal., Police Code art. 45, § 4512(a), (c)(1). Violations of section 4512 are punishable by a fine of up to $1,000 and up to six months in prison. Id. § 4512(e).

San Francisco Police Code section 613.10(g) prohibits the sale of ammunition that (1) has "no sporting purpose," (2) is "designed to expand upon impact and utilize the jacket, shot or materials embedded within the jacket or shot to project or disperse barbs or other objects that are intended to increase the damage to a human body or other target," or (3) is "designed to fragment upon impact." S.F., Cal., Police Code art. 9, § 613.10(g). Bullets that expand or fragment upon impact are generally referred to as "hollow-point" ammunition.

On May 15, 2009, Espanola Jackson, Paul Colvin, Thomas Boyer, Larry Barsetti, David Golden, Noemi Margaret Robinson, the National Rifle Association, and the San Francisco Veteran Police Officers Association brought suit against the City and County of San Francisco, and other defendants, to challenge the validity of Police Code sections 4512 and 613.10(g) as impermissible violations of the right to bear arms under the Second Amendment.2 The individual plaintiffs are handgun owners and citizens of San Francisco "who presently intend to keep their handguns within the home in a manner ready for immediate use to protect themselves and their families." The organizations have brought this suit on behalf of their members, who have an interest in keeping handguns within their home for self-defense.

On August 30, 2012, Jackson moved for a preliminary injunction. The district court denied that motion on November 26, 2012. Plaintiffs filed a timely notice of appeal on December 21, 2012.

III

Jackson challenges the district court's order denying her motion for preliminary injunction of sections 4512 and 613.10(g) on the ground that both infringe upon her Second Amendment rights. To obtain a preliminary injunction, Jackson must establish that (1) she is likely to succeed on the merits; (2) she is likely to suffer irreparable harm in the absence of preliminary relief; (3) the balance of equities tips in her favor; and (4) an injunction is in the public interest. Am. Trucking Ass'ns v. City of Los Angeles, 559 F.3d 1046, 1052 (9th Cir.2009) (citing Winter v. Natural Res. Def. Council, Inc., 555 U.S. 7, 20, 129 S.Ct. 365, 172 L.Ed.2d 249 (2008)). A denial of preliminary injunction is reviewed for abuse of discretion. See Sanders Cnty. Republican Cent. Comm. v. Bullock, 698 F.3d 741, 744 (9th Cir.2012). However, "[t]he district court's interpretation of the underlying legal principles ... is subject to de novo review." Sw. Voter Registration Educ. Project v. Shelley, 344 F.3d 914, 918 (9th Cir.2003).

IV

We turn first to the question whether the district court abused its discretion in concluding that Jackson did not carry her burden of showing a likelihood of success on the merits of her challenge to sections 4512 and 613.10(g).

We begin with the text of the Second Amendment: "A well regulated militia being necessary to the security of a free state, the right of the people to keep and bear arms shall not be infringed." U.S. Const. amend. II. Our analysis of this text starts with District of Columbia v. Heller, 554 U.S. 570, 128 S.Ct. 2783, 171 L.Ed.2d 637 (2008). In Heller, the Supreme Court considered whether the District of Columbia's regulations, which barred the possession of handguns both inside and outside the home, and required other firearms to be kept "unloaded and disassembled or bound by a trigger lock or similar device," violated the plaintiff's Second Amendment rights. 554 U.S. at 575, 128 S.Ct. 2783. After undertaking a lengthy analysis of the original public meaning of the Second Amendment, the Court concluded that it confers "an individual right to keep and bear arms." Id. at 595, 128 S.Ct. 2783. Guided by the same historical inquiry, the Court emphasized that "the inherent right of self-defense has been central to the Second Amendment right." Id. at 628, 128 S.Ct. 2783. Therefore, prohibiting the possession of handguns was unconstitutional. Id. at 628-29, 128 S.Ct. 2783. Similarly, the District of Columbia's requirement that "firearms in the home be rendered and kept inoperable at all times" made "it impossible for citizens to use [firearms] for the core lawful purpose of self-defense and [was] hence unconstitutional." Id. at 630, 128 S.Ct. 2783.3

Heller did not purport to "clarify the entire field" of Second Amendment jurisprudence and does not provide explicit guidance on the constitutionality of regulations which are less restrictive than the near-total ban at issue in that case. Id. at 635, 128 S.Ct. 2783. But Heller's method of analysis suggests a broad framework for addressing Second Amendment challenges. First, Heller determined whether the possession of operable weapons in the home fell within "the historical understanding of the scope of the [Second Amendment] right." Id. at 625, 128 S.Ct. 2783. In conducting this analysis, Heller indicated that the Second Amendment does not preclude certain "longstanding prohibitions" and "presumptively lawful regulatory measures," such as "prohibitions on carrying concealed weapons," "prohibitions on the possession of firearms by felons and the mentally ill," "laws forbidding the carrying of firearms in sensitive places such as schools and government buildings," "laws imposing conditions and qualifications on the commercial sale of arms," and prohibitions on "the carrying of `dangerous and unusual weapons,'" referring to weapons that were not "in common use at the time" of the enactment of the Second Amendment. Id. at 626-27, 627 n. 26, 128 S.Ct. 2783 (internal citations and quotations omitted).

Next, after determining that the possession of operable weapons fell within the scope of the Second Amendment, Heller considered the appropriate level of scrutiny for the challenged regulation. In light of the severity of the restriction posed by the D.C. regulation, Heller determined that it was unconstitutional "[u]nder any of the standards of scrutiny that we have applied to enumerated constitutional rights." Id. at 628, 128 S.Ct. 2783. As Heller made clear, "`[a] statute which, under the pretence of regulating, amounts to a destruction of the right, or which requires arms to be so borne as to render them wholly useless for the purpose of defence, would be clearly unconstitutional.'" Id. at 629, 128 S.Ct. 2783 (quoting State v. Reid, 1 Ala. 612, 616-17 (1840)). While Heller did not specify the appropriate level of scrutiny for Second Amendment claims, it nevertheless confirmed that rational basis review is not appropriate, explaining that "[i]f all that was required to overcome the right to keep and bear arms was a rational basis, the Second Amendment would be redundant with the separate constitutional prohibitions on irrational laws, and would have no effect." Id. at 628 n. 27, 128 S.Ct. 2783.

Like the majority of our sister circuits, we have discerned from Heller's approach a two-step Second Amendment inquiry. See United States v. Chovan, 735 F.3d 1127, 1136-37 (9th Cir.2013) (collecting cases). The two-step inquiry we have adopted "(1) asks whether the challenged law burdens conduct protected by the Second Amendment and (2) if so, directs courts to apply an appropriate level of scrutiny." Id. at 1136 (citing United States v. Chester, 628 F.3d 673, 680 (4th Cir.2010); United States v. Marzzarella, 614 F.3d 85, 89 (3d Cir.2010)). As other circuits have recognized, this inquiry bears strong analogies to the Supreme Court's free-speech caselaw. See, e.g., Ezell v. City of Chicago, 651 F.3d 684, 702-03, 706 (7th Cir.2011) ("Both Heller and McDonald suggest that First Amendment analogies are more appropriate, and on the strength of that suggestion, we and other circuits have already begun to adapt First Amendment doctrine to the Second Amendment context." (internal citation omitted)).

In the first step, we ask "whether the challenged law burdens conduct protected by the Second Amendment," Chovan, 735 F.3d at 1136, based on a "historical understanding of the scope of the [Second Amendment] right," Heller, 554 U.S. at 625, 128 S.Ct. 2783, or whether the challenged law falls within a "well-defined and narrowly limited" category of prohibitions "that have been historically unprotected," Brown v. Entm't Merchants Ass'n, ___ U.S.___, 131 S.Ct. 2729, 2733, 2734, 180 L.Ed.2d 708 (2011). To determine whether a challenged law falls outside the historical scope of the Second Amendment, we ask whether the regulation is one of the "presumptively lawful regulatory measures" identified in Heller, 554 U.S. at 627 n. 26, 128 S.Ct. 2783, or whether the record includes persuasive historical evidence establishing that the regulation at issue imposes prohibitions that fall outside the historical scope of the Second Amendment, Chovan, 735 F.3d at 1137. See also United States v. Alvarez, ___ U.S. ___, 132 S.Ct. 2537, 2544, 183 L.Ed.2d 574 (2012) (noting that only "the few historic and traditional categories [of conduct] long familiar to the bar" fall outside the scope of First Amendment protection (internal quotations omitted)).

If a prohibition falls within the historical scope of the Second Amendment, we must then proceed to the second step of the Second Amendment inquiry to determine the appropriate level of scrutiny. Chovan, 735 F.3d at 1136. When ascertaining the appropriate level of scrutiny, "just as in the First Amendment context," we consider: "(1) `how close the law comes to the core of the Second Amendment right' and (2) `the severity of the law's burden on the right.'" Chovan, 735 F.3d at 1138 (quoting Ezell, 651 F.3d at 703).

In analyzing the first prong of the second step, the extent to which the law burdens the core of the Second Amendment right, we rely on Heller's holding that the Second Amendment has "the core lawful purpose of self-defense," 554 U.S. at 630, 128 S.Ct. 2783, and that "whatever else it leaves to future evaluation, [the Second Amendment] surely elevates above all other interests the right of law-abiding, responsible citizens to use arms in defense of hearth and home." Id. at 635, 128 S.Ct. 2783; see also Chovan, 735 F.3d at 1138 (stating that a core right under the Second Amendment is "the right of law-abiding, responsible citizens to use arms in defense of hearth and home").

In analyzing the second prong of the second step, the extent to which a challenged prohibition burdens the Second Amendment right, we are likewise guided by First Amendment principles. Cf. Ezell, 651 F.3d at 706-07. As we explained in Chovan, laws which regulate only the "manner in which persons may exercise their Second Amendment rights" are less burdensome than those which bar firearm possession completely. 735 F.3d at 1138; see also Ward v. Rock Against Racism, 491 U.S. 781, 791, 109 S.Ct. 2746, 105 L.Ed.2d 661 (1989) (noting that laws that place "reasonable restrictions on the time, place, or manner of protected speech" and that "leave open alternative channels for communication of information," pose less of a burden on the First Amendment right and are reviewed under intermediate scrutiny). Similarly, firearm regulations which leave open alternative channels for self-defense are less likely to place a severe burden on the Second Amendment right than those which do not. Cf. Marzzarella, 614 F.3d at 97 (applying intermediate scrutiny to a regulation which "leaves a person free to possess any otherwise lawful firearm he chooses — so long as it bears its original serial number").

A law that imposes such a severe restriction on the core right of self-defense that it "amounts to a destruction of the [Second Amendment] right," is unconstitutional under any level of scrutiny. Heller, 554 U.S. at 629, 128 S.Ct. 2783 (internal quotations omitted). By contrast, if a challenged law does not implicate a core Second Amendment right, or does not place a substantial burden on the Second Amendment right, we may apply intermediate scrutiny. See, e.g., v. Chovan, 735 F.3d at 1138-39; cf. Heller v. District of Columbia (Heller II), 670 F.3d 1244, 1257 (D.C.Cir.2011) ("[A] regulation that imposes a substantial burden upon the core right of self-defense protected by the Second Amendment must have a strong justification, whereas a regulation that imposes a less substantial burden should be proportionately easier to justify.").

V

We now apply these principles to the facts of this case. We begin by addressing Jackson's facial and as-applied challenge to the constitutionality of section 4512, which requires handguns to be stored in a locked container when not carried on the person.

A

As a threshold issue, San Francisco argues that Jackson may not bring a facial challenge to section 4512. San Francisco contends that Jackson conceded that locked storage is appropriate in some circumstances, such as when it is foreseeable that a child would otherwise gain possession of a firearm. Therefore, San Francisco claims that section 4512 has a "plainly legitimate sweep," and a facial challenge is inappropriate. Wash. State Grange v. Wash. State Republican Party, 552 U.S. 442, 449, 128 S.Ct. 1184, 170 L.Ed.2d 151 (2008) (quoting Wash. v. Glucksberg, 521 U.S. 702, 739-40 & n. 7, 117 S.Ct. 2258, 138 L.Ed.2d 772 (1997)).

San Francisco's argument reflects a misunderstanding of the Supreme Court's jurisprudence. Facial challenges are disfavored for two reasons. First, when considering "complex and comprehensive legislation," we may not "resolve questions of constitutionality with respect to each potential situation that might develop," especially when the moving party does not demonstrate that the legislation "would be unconstitutional in a large fraction of relevant cases." Gonzales v. Carhart, 550 U.S. 124, 167-68, 127 S.Ct. 1610, 167 L.Ed.2d 480 (2007) (internal quotation omitted). Second, facial challenges "often rest on speculation." Wash. State Grange, 552 U.S. at 450, 128 S.Ct. 1184. Consequently, "they raise the risk of premature interpretations of statutes on the basis of factually barebones records," and "threaten to short circuit the democratic process by preventing laws embodying the will of the people from being implemented in a manner inconsistent with the Constitution." Id. at 450-51, 128 S.Ct. 1184.

Jackson's facial challenge to section 4512 raises neither concern. First, section 4512 is not an example of "complex and comprehensive legislation" which may be constitutional in a broad swath of cases. Either it is a permissible burden on the Second Amendment right to "keep and bear arms" or it is not. Second, unlike the voting scheme at issue in Washington State Grange, the constitutionality of section 4512 does not turn on how San Francisco chooses to enforce it. The statute constitutes a flat prohibition on keeping unsecured handguns in the home. On its face, it does not give courts the opportunity to construe the prohibition narrowly or accord the prohibition "a limiting construction to avoid constitutional questions." Id. at 450, 128 S.Ct. 1184.

B

We next apply the two-step inquiry to determine whether section 4512 is constitutional. We consider whether section 4512 burdens conduct protected by the Second Amendment. If so, we then determine an appropriate level of scrutiny. Chovan, 735 F.3d at 1136.

First, we ask whether section 4512 regulates conduct "historically understood to be protected" by the Second Amendment "right to keep and bear arms." Chovan, 735 F.3d at 1136, 1137. In analyzing the scope of the Second Amendment, we begin with the list of "presumptively lawful" regulations provided by Heller. See 554 U.S. at 626-27, 128 S.Ct. 2783; see also Chovan, 735 F.3d at 1137. Section 4512 resembles none of them, because it regulates conduct at home, not in "sensitive places"; applies to all residents of San Francisco, not just "felons or the mentally ill"; has no impact on the "commercial sale of arms," and it regulates handguns, which Heller itself established were not "dangerous and unusual." 554 U.S. at 626-27, 128 S.Ct. 2783.

Nor does section 4512 resemble the prohibitions discussed in "historical evidence in the record before us." Chovan, 735 F.3d at 1137 (internal citation omitted). Heller discusses two founding-era laws which regulated the storage of firearms and gunpowder. See 554 U.S. at 631-32, 128 S.Ct. 2783. First, it notes a 1783 Massachusetts law that prohibited residents of Boston from taking loaded firearms into "any Dwelling House, Stable, Barn, Out-house, Ware-house, Store, Shop or other Building." Id. at 631, 128 S.Ct. 2783 (quoting Act of Mar. 1, 1783, ch. 13, 1783 Mass. Acts p. 218.) Heller indicated that this statute should be construed narrowly in light of its context, "which makes clear that the purpose of the prohibition was to eliminate the danger to firefighters posed by the `depositing of loaded Arms' in buildings." 554 U.S. at 631, 128 S.Ct. 2783. Heller also concluded that the Massachusetts law was an outlier that contradicted "the overwhelming weight of other evidence regarding the right to keep and bear arms for defense of the home." Id. at 632, 128 S.Ct. 2783. With respect to "gunpowder-storage laws," Heller noted they "did not clearly prohibit loaded weapons, but required only that excess gunpowder be kept in a special container or on the top floor of the home." Id. Because Heller rejected the probative value of this evidence, these historical precedents do not establish that San Francisco's requirement is historically longstanding.

The other historical evidence in the record does not establish that prohibitions such as those in section 4512 fall outside the scope of "the Second Amendment, as historically understood." Chovan, 735 F.3d at 1137. San Francisco and its amici note that many states regulated the storage of gunpowder in the founding era, see, e.g., Act of June 28, 1762, 1762-1765 R.I. Acts & Resolves 132 (mandating that large quantities of gunpowder be stored in a powder house); 1784 N.Y. Laws 627 (requiring gunpowder to be stored in appropriate containers), and also point to reconstruction-era state court decisions upholding gunpowder-storage regulations as lawful applications of the state's police powers, see, e.g., Williams v. City Council of Augusta, 4 Ga. 509, 511-12 (1848); Foote v. Fire Dep't of the City of New York., 5 Hill 99, 100 (N.Y.Sup.Ct.1843). But, as noted by Heller, such laws are best described as "fire-safety" regulations. 554 U.S. at 632, 128 S.Ct. 2783. The fact that states historically imposed modest restrictions on the storage of gunpowder, a dangerous and highly flammable substance, does not raise the inference that the Second Amendment is inapplicable to regulations imposing restrictions on the storage of handguns.

Because storage regulations such as section 4512 are not part of a long historical "tradition of proscription," Entm't Merchants Ass'n, 131 S.Ct. at 2734, we conclude that section 4512 burdens rights protected by the Second Amendment, see Chovan, 735 F.3d at 1137.

C

Having determined that section 4512 regulates conduct within the scope of the Second Amendment, we now turn to the second step of the inquiry: deciding what level of heightened scrutiny to apply to the ordinance. The level of scrutiny depends upon "(1) how close the law comes to the core of the Second Amendment right, and (2) the severity of the law's burden on the right." Id. at 1138 (internal quotations omitted).

We first consider whether the conduct regulated by section 4512 is close to the core of the Second Amendment. On its face, section 4512 implicates the core because it applies to law-abiding citizens, and imposes restrictions on the use of handguns within the home. See Heller, 554 U.S. at 635, 128 S.Ct. 2783 (emphasizing "the right of law-abiding responsible citizens to use arms in defense of hearth and home"). Section 4512 requires San Franciscans to choose, while in their homes, between carrying a handgun on their person and storing it in a locked container or with a trigger lock. S.F., Cal., Police Code art. 45, § 4512(a), (c)(1). As Jackson argues, there are times when carrying a weapon on the person is extremely impractical, such as when sleeping or bathing. Therefore, as a practical matter, section 4512 sometimes requires that handguns be kept in locked storage or disabled with a trigger lock. Having to retrieve handguns from locked containers or removing trigger locks makes it more difficult "for citizens to use them for the core lawful purpose of self-defense" in the home. Heller, 554 U.S. at 630, 128 S.Ct. 2783. Section 4512 therefore burdens the core of the Second Amendment right.

This is not the end of our inquiry, however. We next look to the severity of section 4512's burden on the Second Amendment right. Section 4512 does not impose the sort of severe burden imposed by the handgun ban at issue in Heller that rendered it unconstitutional. Id. Unlike the challenged regulation in Heller, id. at 629, 128 S.Ct. 2783, section 4512 does not substantially prevent law-abiding citizens from using firearms to defend themselves in the home. Rather, section 4512 regulates how San Franciscans must store their handguns when not carrying them on their persons. This indirectly burdens the ability to use a handgun, because it requires retrieving a weapon from a locked safe or removing a trigger lock. But because it burdens only the "manner in which persons may exercise their Second Amendment rights," Chovan 735 F.3d at 1138, the regulation more closely resembles a content-neutral speech restriction that regulates only the time, place, or manner of speech. The record indicates that a modern gun safe may be opened quickly. Thus, even when a handgun is secured, it may be readily accessed in case of an emergency. Further, section 4512 leaves open alternative channels for self-defense in the home, because San Franciscans are not required to secure their handguns while carrying them on their person. Provided San Franciscans comply with the storage requirements, they are free to use handguns to defend their home while carrying them on their person.

Thus, Section 4512 does not impose the sort of severe burden that requires the higher level of scrutiny applied by other courts in this context. In Moore v. Madigan, for instance, the government was obliged to meet a higher level of scrutiny than intermediate scrutiny to justify a "blanket prohibition" on carrying an operable gun in public. 702 F.3d 933, 940 (7th Cir.2012). By contrast, section 4512 does not constitute a complete ban, either on its face or in practice, on the exercise of a law-abiding individual's right to self defense. Nor does section 4512 burden Second Amendment rights to the same degree as a Chicago ordinance prohibiting firing ranges in the city, which the Seventh Circuit analyzed under "a more rigorous showing" than intermediate scrutiny, "if not quite `strict scrutiny.'" Ezell, 651 F.3d at 708. The Seventh Circuit reasoned that the "ban is not merely regulatory; it prohibits the law-abiding, responsible citizens of Chicago from engaging in target practice in the controlled environment of a firing range," and was therefore "a serious encroachment on the right to maintain proficiency in firearm use, an important corollary to the meaningful exercise of the core right to possess firearms for self-defense." Id. (internal quotation marks omitted). Section 4512 does not impose such a serious encroachment on the core right; rather, it is more similar to the registration requirements upheld in Heller II. In that case, the D.C. Circuit applied intermediate scrutiny to evaluate registration requirements, including mandatory firearm training and instruction, which "make it considerably more difficult for a person lawfully to acquire and keep a firearm, including a handgun, for the purpose of self-defense in the home...." 670 F.3d at 1255. The D.C. Circuit reasoned that "none of the District's registration requirements prevents an individual from possessing a firearm in his home or elsewhere, whether for self-defense or hunting, or any other lawful purpose," and therefore intermediate scrutiny was appropriate. Id. at 1257-58 (emphasis added). Likewise, section 4512 does not prevent an individual from possessing a firearm in the home.

Accordingly, we conclude section 4512 is not a substantial burden on the Second Amendment right itself. Even though section 4512 implicates the core of the Second Amendment right, because it does not impose a substantial burden on conduct protected by the Second Amendment, we apply intermediate scrutiny. Cf. id.

D

Having determined the applicable standard of review, we must now determine whether section 4512 withstands intermediate scrutiny. "[C]ourts have used various terminology to describe the intermediate scrutiny standard." Chovan, 735 F.3d at 1139; compare Ward v. Rock Against Racism, 491 U.S. 781, 798, 109 S.Ct. 2746, 105 L.Ed.2d 661 (1989) (holding that "a regulation of the time, place, or manner of protected speech must be narrowly tailored to serve the government's legitimate, content-neutral interests but that it need not be the least restrictive or least intrusive means of doing so,") with Bd. of Trs. of State Univ. of N.Y. v. Fox, 492 U.S. 469, 480, 109 S.Ct. 3028, 106 L.Ed.2d 388 (1989) (requiring "the government goal to be substantial, and the cost to be carefully calculated," and holding that "since the State bears the burden of justifying its restrictions, it must affirmatively establish the reasonable fit we require" (internal citation omitted)). But "all forms of the standard require (1) the government's stated objective to be significant, substantial, or important; and (2) a reasonable fit between the challenged regulation and the asserted objective." Chovan, 735 F.3d at 1139.

In analyzing the first prong of intermediate scrutiny review, whether the government's stated objective is significant, substantial, or important, we must first define the government's objective. Cf. id. According to San Francisco, the governmental objective in enacting section 4512 was to reduce the number of gun-related injuries and deaths from having an unlocked handgun in the home. See S.F., Cal., Police Code art. 45, § 4511(1)-(4). In considering a city's justifications for its ordinance, we do not impose "an unnecessarily rigid burden of proof ... so long as whatever evidence the city relies upon is reasonably believed to be relevant to the problem that the city addresses." City of Renton v. Playtime Theatres, Inc., 475 U.S. 41, 50-52, 106 S.Ct. 925, 89 L.Ed.2d 29 (1986). Here, as the legislative findings explain, "[h]aving a loaded or unlocked gun in the home is associated with an increased risk of gun-related injury and death." Id. § 4511(2). San Francisco relied on evidence that "[g]uns kept in the home are most often used in suicides and against family and friends rather than in self-defense," and that children are particularly at risk of injury and death. Id. § 4511(3)-(4). San Francisco therefore sought to "reduce[ ] the risk of firearm injury and death" in the home through the use of trigger locks or lock boxes under section 4512. Id. § 4511(5). "It is self-evident," Chovan, 735 F.3d at 1139, that public safety is an important government interest. See, e.g., Nat'l Treasury Emps. Union v. Von Raab, 489 U.S. 656, 670-71, 677, 109 S.Ct. 1384, 103 L.Ed.2d 685 (1989) (holding that government's compelling interest in public safety justifies drug testing of border agents who carry firearms); Madsen v. Women's Health Ctr., Inc., 512 U.S. 753, 768, 114 S.Ct. 2516, 129 L.Ed.2d 593 (1994) ("The State also has a strong interest in ensuring the public safety and order...."). Accordingly, San Francisco has carried its burden of demonstrating that its locked-storage law serves a significant government interest by reducing the number of gun-related injuries and deaths from having an unlocked handgun in the home.

We next turn to the question whether section 4512 is substantially related to San Francisco's important interest. In considering the question of fit, we review the legislative history of the enactment as well as studies in the record or cited in pertinent case law, Chovan, 735 F.3d at 1140, giving the city "a reasonable opportunity to experiment with solutions to admittedly serious problems," City of Renton, 475 U.S. at 52, 106 S.Ct. 925 (internal quotations omitted). In the legislative findings accompanying section 4512, San Francisco concluded that firearm injuries are the third-leading cause of death in San Francisco, and that having unlocked firearms in the home increases the risk of gun-related injury, especially to children. See S.F., Cal., Police Code art. 45, § 4511(1)(e), (2)-(3). The record contains ample evidence that storing handguns in a locked container reduces the risk of both accidental and intentional handgun-related deaths, including suicide. Based on the evidence that locking firearms increases safety in a number of different respects, San Francisco has drawn a reasonable inference that mandating that guns be kept locked when not being carried will increase public safety and reduce firearm casualties. This evidence supports San Francisco's position that section 4512 is substantially related to its objective to reduce the risk of firearm injury and death in the home.

Jackson contends that section 4512 is over-inclusive because it applies even when the risk of unauthorized access by children or others is low, such as when a handgun owner lives alone. We reject this argument, because San Francisco has asserted important interests that are broader than preventing children or unauthorized users from using the firearms, including an interest in preventing firearms from being stolen and in reducing the number of handgun-related suicides and deadly domestic violence incidents. See id. § 4511(2)(d), (4). Intermediate scrutiny does not require that section 4512 be the least restrictive means of reducing handgun-related deaths. Ward, 491 U.S. at 798, 109 S.Ct. 2746. Moreover, the burden imposed by the legislation is not substantial. San Francisco relied on evidence showing that section 4512 imposes only a minimal burden on the right to self-defense in the home because it causes a delay of only a few seconds while the firearm is unlocked or retrieved from storage. Because the ordinance imposes only a minimal burden on the right to self-defense and San Francisco's interest encompasses more than just preventing minors from gaining access to firearms, the ordinance is appropriately tailored to fit San Francisco's interest.

Accordingly, San Francisco has shown that section 4512's requirement that persons store handguns in a locked storage container or with a trigger lock when not carried on the person is substantially related to the important government interest of reducing firearm-related deaths and injuries. Jackson is thus not likely to succeed on the merits, and we therefore affirm the district court's denial of Jackson's motion for preliminary injunction. Because we decide on this basis, we need not reach Jackson's arguments that she established the remaining prongs of the preliminary injunction standard. See Am. Trucking Ass'ns, 559 F.3d at 1052.

VI

We now turn to the constitutionality of section 613.10(g), which prohibits the sale of hollow-point ammunition within San Francisco.

A

As a threshold issue, San Francisco contends that Jackson lacks standing to challenge section 613.10(g). To satisfy Article III standing, a plaintiff must show: "(1) an `injury in fact' that is `concrete and particularized' and `actual or imminent,' not `conjectural or hypothetical'; (2) a `causal connection between the injury' and the challenged action of the defendant; and (3) that it is `likely, as opposed to merely speculative, that the injury will be redressed by a favorable decision.'" Multistar Indus., Inc. v. U.S. Dep't of Transp., 707 F.3d 1045, 1054 (9th Cir.2013) (quoting Lujan v. Defenders of Wildlife, 504 U.S. 555, 560-61, 112 S.Ct. 2130, 119 L.Ed.2d 351 (1992)). An injury in fact is an "invasion of a legally protected interest." Lujan, 504 U.S. at 560, 112 S.Ct. 2130.

San Francisco asserts that Jackson has not suffered an injury in fact because she could easily obtain hollow-point ammunition outside San Francisco. But the injury Jackson alleges is not the inconvenience of leaving San Francisco; rather, she alleges that the Second Amendment provides her with a "legally protected interest," id., to purchase hollow-point ammunition, and that but for section 613.10(g), she would do so within San Francisco. That Jackson may easily purchase ammunition elsewhere is irrelevant. "In the First Amendment context, the Supreme Court long ago made it clear that one is not to have the exercise of his liberty of expression in appropriate places abridged on the plea that it may be exercised in some other place. The same principle applies here." Ezell, 651 F.3d at 697 (internal citations and quotations omitted). Accordingly, section 613.10(g) constitutes an injury in fact to Jackson, and she has standing to challenge it.

B

Applying the two-step analysis outlined above, we first ask whether a prohibition on the sale of hollow-point ammunition regulates conduct "historically understood to be protected" by the Second Amendment "right to keep and bear arms." Chovan, 735 F.3d at 1136-37.

The Second Amendment protects "arms," "weapons," and "firearms"; it does not explicitly protect ammunition. Nevertheless, without bullets, the right to bear arms would be meaningless. A regulation eliminating a person's ability to obtain or use ammunition could thereby make it impossible to use firearms for their core purpose. Cf. Heller, 554 U.S. at 630, 128 S.Ct. 2783 (holding that "the District's requirement (as applied to respondent's handgun) that firearms in the home be rendered and kept inoperable at all times ... makes it impossible for citizens to use them for the core lawful purpose of self-defense and is hence unconstitutional"). Thus "the right to possess firearms for protection implies a corresponding right" to obtain the bullets necessary to use them. Cf. Ezell, 651 F.3d at 704 (holding that the right to possess firearms implied a corresponding right to have access to firing ranges in order to train to be proficient with such firearms). Indeed, Heller did not differentiate between regulations governing ammunition and regulations governing the firearms themselves. See 554 U.S. at 632, 128 S.Ct. 2783. Rather, the Court considered the burden certain gunpowder-storage laws imposed on the Second Amendment right, and determined that they did not burden "the right of self-defense as much as an absolute ban on handguns." Id. This observation would make little sense if regulations on gunpowder and ammunition fell outside the historical scope of the Second Amendment.

Conducting our historical review, we conclude that prohibitions on the sale of ammunition do not fall outside "the historical understanding of the scope of the [Second Amendment] right." Id. at 625, 128 S.Ct. 2783. Heller does not include ammunition regulations in the list of "presumptively lawful" regulations. See id. at 626-27, 627 n. 26, 128 S.Ct. 2783. Nor has San Francisco pointed to historical prohibitions discussed in case law or other "historical evidence in the record before us" indicating that restrictions on ammunition fall outside of the historical scope of the Second Amendment. Chovan, 735 F.3d at 1137 (internal quotation omitted).

Because restrictions on ammunition may burden the core Second Amendment right of self-defense and the record contains no persuasive historical evidence suggesting otherwise, section 613.10(g) regulates conduct within the scope of the Second Amendment.

C

We next turn to the appropriate level of scrutiny to apply to the challenged regulation. We consider how close section 613.10(g) is to the core of the Second Amendment right, and the severity of its burden on that right. See Chovan, 735 F.3d at 1138.

We first consider how close San Francisco's ban on the sale of hollow-point bullets comes to the core of the Second Amendment right. Jackson contends that hollow-point bullets are far better for self-defense than fully jacketed ammunition because they have greater stopping power and are less likely to overpenetrate or ricochet. Barring their sale, she argues, therefore imposes a substantial burden on the right of self-defense. We disagree. There is no evidence in the record indicating that ordinary bullets are ineffective for self-defense. Moreover, section 613.10(g) prohibits only the sale of hollow-point ammunition within San Francisco, not the use or possession of such bullets. Such a sales prohibition burdens the core right of keeping firearms for self-defense only indirectly, because Jackson is not precluded from using the hollow-point bullets in her home if she purchases such ammunition outside of San Francisco's jurisdiction.

Nor does section 613.10(g) place a substantial burden on the Second Amendment right. A ban on the sale of certain types of ammunition does not prevent the use of handguns or other weapons in self-defense. The regulation in this case limits only the manner in which a person may exercise Second Amendment rights by making it more difficult to purchase certain types of ammunition. This is akin to a content-neutral time, place, and manner restriction, such as a regulation which prevents a person from owning a firearm with an obliterated serial number while not barring the possession of an otherwise lawful firearm. See Marzzarella, 614 F.3d at 97. Further, section 613.10(g) leaves open alternative channels for self-defense in the home. Jackson may either use fully-jacketed bullets for self-defense or obtain hollow-point bullets outside of San Francisco's jurisdiction. Because section 613.10(g) neither regulates conduct at the core of the Second Amendment right nor burdens that right severely, we review it under intermediate scrutiny.

D

In considering whether section 613.10(g) withstands intermediate scrutiny, we must first define the governmental interest served by section 613.10(g), and determine whether it is substantial. Again, we review the legislative history of the enactment as well as studies in the record or cited in pertinent case law. Chovan, 735 F.3d at 1139. In the legislative findings accompanying section 613.10(g), San Francisco states that it "has a legitimate, important and compelling government interest in reducing the likelihood that shooting victims in San Francisco will die of their injuries by reducing the lethality of the ammunition sold and used in the City and County of San Francisco." S.F., Cal., Police Code art. 9, § 613.9.5(6). It is self-evident that San Francisco's interest in reducing the fatality of shootings is substantial. See Chovan, 735 F.3d at 1139.

We next consider the fit between section 613.10(g) and this interest to determine whether section 613.10 is substantially related to San Francisco's important interest of reducing the lethality of ammunition. See id. at 1140.

Legislative findings explain San Francisco's reasons for adopting the approach in section 613.10(g). Section 613.9.5(2) states that hollow-point bullets are "designed to tear larger wounds in the body by flattening and increasing in diameter on impact," and that "[t]hese design features increase the likelihood that the bullet will hit a major artery or organ." Therefore, San Francisco concluded that hollowpoint bullets are "more likely to cause severe injury and death than is conventional ammunition that does not flatten or fragment upon impact." Id. Jackson generally argues that these legislative findings rely on bad science and erroneous assumptions. More specifically, she challenges San Francisco's conclusion that hollow-point ammunition is more lethal than other bullets. She bases this argument on an American Bar Association publication, which states that "medical examiners have been unable to show any difference in lethality between hollow-point and traditional round-nosed lead bullets." Lisa Steel, Ballistics, in Science for Laywers 11 (ABA Sec. of Sci. & Tech. Law) (Eric York Drogin ed., 2008).

We are not persuaded by Jackson's arguments. The Supreme Court has held that a municipality may rely on any evidence "reasonably believed to be relevant" to substantiate its important interest in regulating speech. City of Renton, 475 U.S. at 51-52, 106 S.Ct. 925. Of course, "the municipality's evidence must fairly support the municipality's rationale for its ordinance," City of Los Angeles v. Alameda Books, Inc., 535 U.S. 425, 438, 122 S.Ct. 1728, 152 L.Ed.2d 670 (2002) (plurality), and courts should not credit facially implausible legislative findings. In this case, San Francisco's evidence more than "fairly supports" its conclusion that hollow-point bullets are more lethal than other types of ammunition. At most, Jackson's evidence suggests that the lethality of hollow-point bullets is an open question, which is insufficient to discredit San Francisco's reasonable conclusions. Section 613.10(g) is a reasonable fit for achieving its objective of reducing the lethality of ammunition because it targets only that class of bullet which exacerbates lethal firearm-related injuries.

Jackson contends that San Francisco could have adopted less burdensome means of restricting hollow-point ammunition, for example by prohibiting the possession of hollow-point bullets in public, but allowing their purchase for home defense. See, e.g., N.J. Stat. Ann. § 2C:39-3(f), (g). Even if this is correct, intermediate scrutiny does not require the least restrictive means of furthering a given end. Ward, 491 U.S. at 798, 109 S.Ct. 2746. City of Renton emphasizes that a "city must be allowed a reasonable opportunity to experiment with solutions to admittedly serious problems." 475 U.S. at 52, 106 S.Ct. 925 (internal quotation omitted). We also doubt that the laws to which Jackson points are indeed less burdensome than section 613.10(g). Because section 613.10(g) affects only the sale of hollow-point ammunition, San Franciscans are free to use and possess hollow-point bullets within city limits. Under Jackson's "less burdensome" alternatives, individuals would face criminal prosecution for possessing such ammunition outside the home. Given the availability of alternative means for procuring hollow-point ammunition, section 613.10(g) imposes only modest burdens on the Second Amendment right.

Accordingly, we conclude that San Francisco carried its burden of establishing that section 613.10(g) is a reasonable fit to achieve its goal of reducing the lethality of ammunition, and section 613.10(g) thus satisfies intermediate scrutiny. We therefore conclude that Jackson has not carried her burden of showing she is likely to succeed on the merits. Accordingly, we need not reach the remaining preliminary injunction factors. See Am. Trucking Ass'ns, 559 F.3d at 1052.

VII

We recognize the significance of the Second Amendment right to keep and bear arms. "[I]t is clear that the Framers and ratifiers of the Fourteenth Amendment counted the right to keep and bear arms among those fundamental rights necessary to our system of ordered liberty." Mc-Donald, 130 S.Ct. at 3042. But we also recognize that the Second Amendment right, like the First Amendment right to freedom of speech, may be subjected to governmental restrictions which survive the appropriate level of scrutiny. Because San Francisco's regulations do not destroy the Second Amendment right, and survive intermediate scrutiny, the district court did not abuse its discretion in concluding that Jackson would not succeed on the merits of her claims. We therefore affirm the district court's denial of Jackson's motion for preliminary injunction.

AFFIRMED.