OPINION OF THE COURT
This appeal presents a single issue, whether Defendant Michael Marzzarella’s conviction under 18 U.S.C. § 922(k) for possession of a handgun with an obliterated serial number violates his Second Amendment right to keep and bear arms. We hold it does not and accordingly will affirm the conviction.
I.
In April 2006, the Pennsylvania State Police were notified by a confidential informant that Marzzarella was involved in the sale of stolen handguns. On April 25, the confidential informant arranged a purchase of handguns from Marzzarella. The next day, State Trooper Robert Toski, operating in an undercover capacity, accompanied the informant to Marzzarella’s *88 home in Meadville, Pennsylvania, where Toski purchased a .25 caliber Titan pistol with a partially obliterated serial number for $200. On May 16, Marzzarella sold Toski a second firearm and informed him that its serial number could be similarly obliterated.
On June 12, 2007, Marzzarella was indicted for possession of a firearm with an obliterated serial number, in violation of § 922(k).
1
No charges were brought for the sale of the Titan pistol or the sale or possession of the second firearm. Marzzarella moved to dismiss the indictment, arguing § 922(k), as applied, violated his Second Amendment right to keep and bear arms, as recognized by the Supreme Court in
District of Columbia v. Heller,
— U.S. -,
After the denial of the motion to dismiss the indictment, Marzzarella entered a conditional guilty plea, reserving the right to appeal the constitutionality of § 922(k). The District Court sentenced him to nine months imprisonment. Marzzarella now appeals. 2
II.
The Second Amendment provides: “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. To determine whether § 922(k) impermissibly burdens Marzzarella’s Second Amendment rights, we begin with Heller. 3
*89
In
Heller,
the Supreme Court struck down several District of Columbia statutes prohibiting the possession of handguns and requiring lawfully owned firearms to be kept inoperable.
As we read
Heller,
it suggests a two-pronged approach to Second Amendment challenges. First, we ask whether the challenged law imposes a burden on conduct falling within the scope of the Second Amendment’s guarantee.
Cf. United States v. Stevens,
A.
Our threshold inquiry, then, is whether § 922(k) regulates conduct that falls within the scope of the Second Amendment. In other words, we must determine whether the possession of an unmarked firearm in the home is protected by the right to bear arms. In defining the Second Amendment, the Supreme Court began by analyzing the text of the “operative clause,” which provides that “the right of the people to keep and bear Arms, shall not be infringed.”
Heller,
But the right protected by the Second Amendment is not unlimited.
5
Id.
at 2816;
see also McDonald v. City of Chicago
, — U.S. -,
Moreover, the Court identified several other valid limitations on the right similarly derived from historical prohibitions. Id. at 2816-17.
Although we do not undertake an exhaustive historical analysis today of the full scope of the Second Amendment, nothing in our opinion should be taken to cast doubt on longstanding prohibitions on the possession of firearms by felons and the mentally ill, or laws forbidding the carrying of firearms in sensitive places such as schools and government buildings, or laws imposing conditions and qualifications on the commercial sale of arms.
Id. The Court explained that this list of “presumptively lawful regulatory measures” was merely exemplary and not exhaustive. Id. at 2817 n. 26.
We recognize the phrase “presumptively lawful” could have different meanings under newly enunciated Second Amendment doctrine. On the one hand, this language could be read to suggest the identified restrictions are presumptively lawful because they regulate conduct outside the scope of the Second Amendment. On the other hand, it may suggest the restrictions are presumptively lawful because they pass muster under any standard of scrutiny. Both readings are reasonable interpretations, but we think the better reading, based on the text and the structure of
Heller,
is the former — in other words, that these longstanding limitations are exceptions to the right to bear arms.
6
Immediately following the above-quoted passage, the Court discussed “another important limitation” on the Second Amendment— restrictions on the types of weapons individuals may possess.
Heller,
This reading is also consistent with the historical approach
Heller
used to define the scope of the right. If the Second Amendment codified a pre-existing right to bear arms,
id.
at 2797, it codified the preratification understanding of that right,
id.
at 2821 (“Constitutional rights are enshrined with the scope they were understood to have when the people adopted them....”). Therefore, if the right to bear arms as commonly understood at the time of ratification did not bar restrictions on possession by felons or the mentally ill, it follows that by constitutionalizing this understanding, the Second Amendment carved out these limitations from the right. Moreover, the specific language chosen by the Court refers to “prohibitions” on the possession of firearms by felons and the mentally ill.
Id.
at 2816-17. The endorsement of prohibitions as opposed to regulations, whose validity would turn on the presence or absence of certain circumstances, suggests felons and the mentally
*92
ill are disqualified from exercising their Second Amendment rights.
7
The same is true for “laws forbidding the carrying of firearms in sensitive places.”
8
Heller,
Accordingly, Heller delineates some of the boundaries of the Second Amendment right to bear arms. 9 At its core, the Second Amendment protects the right of law-abiding citizens to possess non-dangerous 10 weapons for self-defense in the home. Id. at 2821 (“[Wjhatever else [the Second Amendment] leaves to future evaluation, it surely elevates above all other interests the right of law-abiding, responsible citizens to use arms in defense of hearth and home.”). And certainly, to some degree, it must protect the right of law-abiding citizens to possess firearms for other, as-yet-undefined, lawful purposes. See, e.g., id. at 2801 (discussing hunting’s importance to the pre-ratification conception of the right); id. (discussing the right to bear arms as a bulwark against potential governmental oppression). The right is not unlimited, however, as the Second Amendment affords no protection for the possession of dangerous and unusual weapons, possession by felons and the mentally ill, and the carrying of weapons in certain sensitive places. Id. at 2816-17.
But
Heller
did not purport to fully define all the contours of the Second Amendment,
id.
at 2816 (“[W]e do not undertake an exhaustive historical analysis today of the full scope of the Second Amendment ....”), and accordingly, much of the scope of the right remains unsettled. While the Second Amendment clearly protects possession for certain lawful purposes, it is not the case that all possession for these purposes is protected conduct. For example, although the Second Amendment protects the individual right to possess firearms for defense of hearth and home,
Heller
suggests, and many of our sister circuits have held, a felony conviction disqualifies an individual from asserting that interest.
See
Moreover, Heller's list of presumptively lawful regulations is not exhaustive,
Section 922(k)’s prohibition of the possession of firearms with “removed, obliterated, or altered” serial numbers is one of those regulations unmentioned by
Heller.
Marzzarella argues § 922(k) is unconstitutional because the Second Amendment categorically protects the right to possess unmarked firearms.
Heller
defined the Second Amendment by looking to what the right meant at the time of ratification.
We are not persuaded by Marzzarella’s historical syllogism. His argument rests on the conception of unmarked firearms as a constitutionally recognized class of firearms, in much the same way handguns constitute a class of firearms. That premise is unavailing.
Heller
cautions against using such a historically fact-bound approach when defining the types of weapons within the scope of the right.
Furthermore, it also would make little sense to categorically protect a class of weapons bearing a certain characteristic wholly unrelated to their utility. Heller distinguished handguns from other classes of firearms, such as long guns, by looking to their functionality. Id. at 2818 (citing handguns’ ease in storage, access, and use in case of confrontation). But unmarked firearms are functionally no different from marked firearms. The mere fact that some firearms possess a nonfunctional characteristic should not create a categorically protected class of firearms on the basis of that characteristic.
Although there is no categorical protection for unmarked firearms, Marzzarella’s conduct may still fall within the Second Amendment because his possession of the Titan pistol in his home implicates his interest in the defense of hearth and home — the core protection of the Second Amendment. While the burden on his ability to defend himself is not as heavy as the one involved in
Heller,
infringements on protected rights can be, depending on the facts, as constitutionally suspect as outright bans.
See United States v. Playboy Entm’t Group, Inc.,
We are skeptical of Marzzarella’s argument that possession in the home is conclusive proof that § 922(k) regulates protected conduct. Because the presence of a serial number does not impair the use or functioning of a weapon in any way, the burden on Marzzarella’s ability to defend himself is arguably
de minimis.
Section 922(k) did not bar Marzzarella from possessing any otherwise lawful marked firearm for the purpose of self-defense, and a person is just as capable of defending himself with a marked firearm as with an unmarked firearm. With or without a serial number, a pistol is still a pistol. Furthermore, it cannot be the case that possession of a firearm in the home for self-defense is a protected form of possession under all circumstances. By this rationale, any type of firearm possessed in the home would be protected merely because it could be used for self-defense. Possession of machine guns or short-barreled shotguns — or any other dangerous and unusual weapon' — so long as they were kept in the home, would then fall within the Second Amendment. But the Supreme Court has made clear the Second Amendment does not protect those types of weapons.
See Miller,
It is arguably possible to extend the exception for dangerous and unusual weapons to cover unmarked firearms. “[T]he Second Amendment does not protect those weapons not typically possessed by law-abiding citizens for lawful purposes .... ”
Heller,
Accordingly, while the Government argues that § 922(k) does not impair any Second Amendment rights, we cannot be certain that the possession of unmarked firearms in the home is excluded from the right to bear arms. Because we conclude § 922(k) would pass constitutional muster even if it burdens protected conduct, we need not decide whether Marzzarella’s right to bear arms was infringed.
B.
Assuming § 922(k) burdens Marzzarella’s Second Amendment rights, we evaluate the law under the appropriate standard of constitutional scrutiny.
Heller
did not prescribe the standard applicable to the District of Columbia’s handgun ban.
The Government argues a rational basis test 13 should apply to § 922(k), but Heller *96 rejects that standard for laws burdening Second Amendment rights. Id. at 2816 n. 27. The Court noted that even a law as burdensome as the District of Columbia’s handgun ban would be constitutional under a rational basis test. Id. The fact that the ban was struck down, therefore, indicates some form of heightened scrutiny must have applied. Moreover, “[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.
Marzzarella, on the other hand, contends we must apply strict scrutiny
14
because the right to bear arms is an enumerated fundamental constitutional right.
See McDonald,
If the Second Amendment can trigger more than one particular standard of scrutiny, § 922(k) should merit a less stringent standard than the one that would have applied to the District of Columbia’s handgun ban. While it is not free from doubt, we think this means that § 922(k) should be evaluated under intermediate scrutiny. The burden imposed by the law does not severely limit the possession of firearms. The District of Columbia’s handgun ban is an example of a law at the far end of the spectrum of infringement on protected Second Amendment rights.
Heller,
Furthermore, the legislative intent behind § 922(k) was not to limit the ability of persons to possess any class of firearms. While the intent of the District of Columbia’s ban was to prevent the possession of handguns, § 922(k) permits possession of all otherwise lawful firearms. As Congress indicated with respect to the Omnibus Crime Control and Safe Streets Act of 1968 — which included § 922(k)’s predecessor:
It is not the purpose of the title to place any undue or unnecessary restrictions or burdens on responsible, law-abiding citizens with respect to the acquisition, possession, transporting, or use of firearms appropriate to ... personal protection, or any other lawful activity. The title is not intended to discourage or eliminate the private ownership of such firearms by law-abiding citizens for lawful purposes ....
S. Rep. 90-1097, at 28 (1968), reprinted in 1968 U.S.C.C.A.N. 2112, 2114. Section 922(k) is designed to prohibit possession of only unmarked firearms, while leaving the possession of marked firearms untouched.
Because § 922(k) was neither designed to nor has the effect of prohibiting the possession of any class of firearms, it is more accurately characterized as a regulation of the manner in which persons may lawfully exercise their Second Amendment rights. The distinction between limitations on the exercise of protected conduct and regulation of the form in which that conduct occurs also appears in the First Amendment context. Discrimination against particular messages in a public forum is subject to the most exacting scrutiny.
See Turner Broad. Sys., Inc. v. FCC,
In the First Amendment speech context, intermediate scrutiny is articulated in several different forms.
See Turner Broad. Sys.,
Those requirements are met here. First, we think it plain that § 922(k) serves a law enforcement interest in enabling the tracing of weapons via their serial numbers. Section 922(k) was enacted by the Gun Control Act of 1968, Pub.L. No. 90-618, 82 Stat. 1213, 1221.
16
The objective of this Act was “to keep firearms away from the persons Congress classified as potentially irresponsible and dangerous.”
Barrett v. United States,
Section 922(k) also fits reasonably with that interest in that it reaches only conduct creating a substantial risk of rendering a firearm untraceable. Because unmarked weapons are functionally no dif *99 ferent from marked weapons, § 922(k) does not limit the possession of any class of firearms. Moreover, because we, like the District Court, cannot conceive of a lawful purpose for which a person would prefer an unmarked firearm, the burden will almost always fall only on those intending to engage in illicit behavior. Regulating the possession of unmarked firearms — and no other firearms — therefore fits closely with the interest in ensuring the traceability of weapons. Accordingly, § 922(k) passes muster under intermediate scrutiny.
Although we apply intermediate scrutiny, we conclude that even if strict scrutiny were to apply to § 922(k), the statute still would pass muster. For a law to pass muster under strict scrutiny, it must be “narrowly tailored to serve a compelling state interest.”
FEC v. Wis. Right to Life, Inc.,
While First Amendment jurisprudence has articulated a comprehensive doctrine around what can and cannot be a compelling interest for restrictions on speech,
see, e.g.,
Eugene Volokh,
Freedom of Speech, Permissible Tailoring and Transcending Strict Scrutiny,
144 U. Pa. L.Rev. 2417, 2419-21 (1996), Second Amendment jurisprudence is not yet so developed. As we discussed above, serial number tracing serves a governmental interest in enabling law enforcement to gather vital information from recovered firearms. Because it assists law enforcement in this manner, we find its preservation is not only a substantial but a compelling interest.
See United States v. Salerno,
Marzzarella would have us conclude that serial number tracing is not a genuine compelling interest because current federal law does not mandate an intensive enough registration and tracing system to always provide a picture of the entire chain of custody of a recovered firearm. If a regulation fails to cover a substantial amount of conduct implicating the asserted compelling interest, its underinclusiveness can be evidence that the interest is not significant enough to justify the regulation.
See Carey v. Brown,
We see no reason to view serial number tracing so narrowly. The direct tracing of the chain of custody of firearms involved in crimes is one useful means by which serial numbers assist law enforcement.
19
But serial number tracing also provides agencies with vital criminology statistics — including a detailed picture of the geographical source areas for firearms trafficking and “time-to-crime” statistics which measure the time between a firearm’s initial retail sale and its recovery in a crime
20
— as well as allowing for the identification of individual dealers involved in the trafficking of firearms and the matching of ballistics data with recovered firearms.
21
Section 922(k), therefore, “demonstrate[s] [Congress’s] commitment to advancing” the compelling interest of preserving serial number tracing.
Fla. Star,
Section 922(k) must also be narrowly tailored to serve that interest. Narrow tailoring requires that the regulation actually advance the compelling interest it is designed to serve.
See Eu v. S.F. County Democratic Cent. Comm.,
Marzzarella argues § 922(k) is overinclusive and, therefore, fails narrow tailoring. Because in certain cases — such as Marzzarella’s — it is possible through laboratory procedures to discern the original serial number of a firearm despite efforts to remove, obliterate, or alter it, he contends § 922(k) goes further than is required. Presumably, Marzzarella believes the overinclusiveness could be cured by applying § 922(k) only where, upon recovery of the firearm and subsequent laboratory testing, the serial number still cannot be read. 22 But we do not think the fact that, in some cases, ex post circumstances *101 can allow for the deciphering of a serial number renders § 922(k) insufficiently tailored. The statute protects the compelling interest of tracing firearms by discouraging the possession and use of firearms that are harder or impossible to trace. It does this by criminalizing the possession of firearms which have been altered to make them harder or impossible to trace. That these actions sometimes fail does not make the statute any less properly designed to remedy the problem of untraceable firearms. Accordingly, we find § 922(k) is narrowly tailored.
III.
Second Amendment doctrine remains in its nascency, and lower courts must proceed deliberately when addressing regulations unmentioned by Heller. Accordingly, we hesitate to say Marzzarella’s possession of an unmarked firearm in his home is unprotected conduct. But because § 922(k) would pass muster under either intermediate scrutiny or strict scrutiny, Marzzarella’s conviction must stand.
For the foregoing reasons, we will affirm the District Court’s denial of Marzzarella’s motion to dismiss the indictment and affirm his judgment of conviction and sentence.
Notes
. Section 922(lc) provides:
It shall be unlawful for any person knowingly to transport, ship, or receive, in interstate or foreign commerce, any firearm which has had the importer’s or manufacturer’s serial number removed, obliterated, or altered or to possess or receive any firearm which has had the importer’s or manufacturer's serial number removed, obliterated, or altered and has, at any time, been shipped or transported in interstate or foreign commerce.
We recognize the words "removed,” "obliterated,” and "altered” may denote distinct actions.
See United States v. Carter,
. The District Court had jurisdiction over Marzzarella's indictment under 18 U.S.C. § 3231. We have jurisdiction over the appeal pursuant to 28 U.S.C. § 1291. We exercise plenary review of a constitutional challenge to the application of a statute.
United States v. Fullmer,
. The Supreme Court recently issued its decision in
McDonald v. City of
Chicago,-U.S. -,
. Because
Heller
is the first Supreme Court case addressing the scope of the individual right to bear arms, we look to other constitutional areas for guidance in evaluating Second Amendment challenges. We think the First Amendment is the natural choice.
Heller
itself repeatedly invokes the First Amendment in establishing principles governing the Second Amendment.
See, e.g.,
. There is some dispute over whether the language from
Heller
limiting the scope of the Second Amendment is dicta.
Compare United States v. Scroggins, 599
F.3d 433, 451 (5th Cir.2010) (characterizing this language as dicta),
petition for cert. filed, (U.S.
June 1, 2010) (09-11204),
and United States v. McCane,
. See Joseph Blocher, Categoricalism and Balancing in First and Second Amendment Analysis, 84 N.Y.U. L.Rev. 375, 413 (2009) ("Heller categorically excludes certain types of 'peopie' and 'Arms’ from Second Amendment coverage, denying them any constitutional protection whatsoever.”).
. See Blocher, supra note 5, at 414 (reading this language to stand for the proposition that "felons and the mentally ill, however defined, are excluded entirely from Second Amendment coverage”).
. Commercial regulations on the sale of firearms do not fall outside the scope of the Second Amendment under this reading.
Heller
endorsed "laws imposing conditions and qualifications on the commercial sale of firearms.”
. McDonald concerns primarily the incorporation of the Second Amendment; its discussion of the scope of the right to bear arms is coextensive with Heller's.
. By "non-dangerous weapons,” we refer to weapons that do not trigger Miller's exception for dangerous and unusual weapons.
. Marzzarella does not cite to any source for this assertion, but it appears that serial numbers arose only with the advent of mass production of firearms. See Thomas Henshaw, The History of Winchester Firearms 1866-1992, at ix (6th ed.1993) (listing the first recorded serial number on a Winchester firearm as appearing in 1866); National Park Service, U.S. Department of the Interior, Springfield Armory National Historic Site— M1865 — 88 rifles, http://www.nps.gov/spar/ histoiyculture/ml865-88-rifles.htm (last visited July 8, 2010) (stating that no serial num *94 bers appeared on Springfield Armory weapons until 1868).
. The Government argues Marzzarella did not possess the firearm for self-defense purposes because he intended to sell it to Toski. But the Government elected to indict Marzzarelia only for possession of the handgun, not the sale. If he possessed the pistol for self-defense purposes, its subsequent sale would not somehow retroactively eliminate that interest.
. A rational basis test presumes the law is valid and asks only whether the statute is
*96
rationally related to a legitimate state interest.
City of Cleburne v. Cleburne Living Ctr.,
. Strict scrutiny asks whether the law is narrowly tailored to serve a compelling government interest.
Playboy Entm't Group,
. While we recognize the First Amendment is a useful tool in interpreting the Second Amendment, we are also cognizant that the precise standards of scrutiny and how they apply may differ under the Second Amendment.
. This restriction was originally enacted by the Federal Firearms Act of 1938, Pub.L. No. 75-785, 52 Slat. 1250, 1251.
. See Department of the Treasury, Bureau of Alcohol, Tobacco & Firearms, Following the Gun: Enforcing Federal Laws Against Firearms Traffickers x (2000), available at http:// www.mayorsagainstillegalguns.org/ downloads/pdf/Following_the_Gun% 202000. pdf. Although the ATF report Following the Gun does not appear in the record, Marzzarella cites to it in his opening brief. We consider its use unobjectionable.
. See id. at 17 (referring to firearms sold secondhand as "untraceable”).
. See Following the Gun, supra note 17, at 44 ("[T]racing was used as an investigative tool to gain information on recovered crime guns in 60 percent of the investigations....”).
. The reporting of trace data by the ATF has been partially restricted by the Tiahrt Amendments to federal appropriations bills, Pub.L. No. 111-8, 123 Stat. 524, 575 (2009) (codified as Note to 18 U.S.C. § 923). Currently, the restriction prevents the ATF from publicly disclosing trace data, and precludes the data from being disclosed or used in any civil action. Id. It does not restrict the reporting of this data to law enforcement agencies. Id.
. See Following the Gun, supra note 17, at 41-44.
. We have our doubts about the administrability of such a standard. For starters, how much effort by law enforcement agencies would be required before courts could determine the serial number was unreadable? Moreover, the standard would provide uneven deterrence because persons would be unaware at the time of commission whether their conduct would lead to criminal liability or not. Section 922(k), read in this manner, would likely be difficult to apply.
