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Likewise, the record in this case shows unequivocally that LCMs are commonly kept by American citizens, as there are more than 75 million such magazines in circulation in the United States. In fact, these magazines are so common that they are standard. “[O]n a nationwide basis most pistols are manufactured with magazines holding ten to 17 rounds.” J.A. 2122. Even more than 20 years ago, “fully 18 percent of all firearms owned by civilians . . . were equipped with magazines holding more than ten rounds.” Heller II, 670 F.3d at 1261. Virtually every federal court to have addressed this question has concluded that “magazines having a capacity to accept more than ten rounds are in common use.” Fyock v. City of Sunnyvale, 25 F. Supp. 3d 1267, 1275 (N.D. Cal. 2014) (noting such magazines comprise “approximately 47 percent of all magazines owned” and number “in the tens-of-millions, even under the most conservative estimates” (internal quotation marks omitted), aff’d, 779 F.3d 991, 998 (9th Cir. 2015) (“[W]e cannot say that the district court abused its discretion by inferring from the evidence of record that, at a minimum, magazines are in common
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use.”). “There may well be some capacity above which magazines are not in common use but, if so, the record is devoid of evidence as to what that capacity is; in any event, that capacity surely is not ten.”

In addition, we reject the State’s argument that the Second Amendment does not apply to detachable magazines because magazines are not firearms—that is, detachable magazines do not constitute “bearable” arms that are expressly protected by the Second Amendment. See U.S. Const. amend.

We think it is beyond dispute from the record before us, which contains much of the same evidence cited in the aforementioned decisions, that law-abiding citizens commonly possess semi-automatic rifles such as the AR-15. Between 1990 and 2012, more than 8 million AR- and AK-platform semi-automatic rifles alone were manufactured in or imported into the United States. In 2012, semi-automatic sporting rifles accounted for twenty percent of all retail firearms sales.

For perspective, we note that in 2012, the number of AR- and AK-style weapons manufactured and imported into the United States was more than double the number of Ford F-150 trucks sold, the most commonly sold vehicle in the United States.

In April 2013, Maryland passed the Firearm Safety Act (“FSA”), which, among other things, bans law-abiding citizens, with the exception of retired law enforcement officers, from possessing the vast majority of semi-automatic rifles commonly kept by several million American citizens for defending their families and homes and other lawful purposes.

Plaintiffs raise a number of challenges to the FSA, contending that the “assault weapons” ban trenches upon the core Second Amendment right to keep firearms in defense of hearth and home, that the FSA’s ban of certain larger-capacity detachable magazines (“LCMs”) likewise violates the Second Amendment, that the exception to the ban for retired officers violates the Equal Protection Clause, and that the FSA is void for vagueness to the extent that it prohibits possession of “copies” of the specifically identified semi-automatic rifles banned by the FSA.

The district court rejected Plaintiffs’ Second Amendment challenges, concluding that the “assault weapons” and larger-capacity magazine bans passed constitutional muster under intermediate scrutiny review. The district court also denied Plaintiffs’ equal protection and vagueness claims.


In our view, Maryland law implicates the core protection of the Second Amendment—“the right of law-abiding responsible citizens to use arms in defense of hearth and home,” District of Columbia v. Heller, 554 U.S. 570, 635 (2008), and we are compelled by Heller and McDonald v. City of Chicago, 561 U.S. 742 (2010), as well as our own precedent in the wake of these decisions, to conclude that the burden is substantial and strict scrutiny is the applicable standard of review for Plaintiffs’ Second Amendment claim. Thus, the panel vacates the district court’s denial of Plaintiffs’ Second Amendment claims and remands for the district court to apply strict scrutiny. The panel affirms the district court’s denial of Plaintiffs’ Equal Protection challenge to the statutory exception allowing retired law enforcement officers to possess prohibited semi-automatic rifles. And, the panel affirms the district court’s conclusion that the term “copies” as used by the FSA is not unconstitutionally vague.