Who knew?
" ATF has classified certain muzzle loading models as firearms. All of these models incorporate the frame or receiver of a firearm that is capable of accepting barrels designed to fire conventional rimfire or centerfire fixed ammunition. These muzzle loading models do not meet the definition of “antique firearm” as that term is defined in 18 U.S.C. § 921(a)(16), and are “firearms” as defined in 18 U.S.C. § 921(a)(3). Furthermore, as firearms, these and similar models, regardless of the barrel installed on the firearm or provided with the firearm, are subject to all provisions of the GCA. Persons who purchase these firearms from licensed dealers are required to fill out a Firearms Transaction Record, ATF Form 4473, and are subject to a National Instant Criminal Background Check System (NICS) check. Felons and other prohibited persons may not lawfully receive or possess these firearms or ammunition.
The following is a list of weapons that load from the muzzle and are classified as firearms, not antiques, under the GCA, because they incorporate the frame or receiver of a firearm: • Savage Model 10ML (early, 1st version) • Mossberg 500 shotgun with muzzle loading barrel • Remington 870 shotgun with muzzle loading barrel • Mauser 98 rifle with muzzle loading barrel • SKS rifle with muzzle loading barrel • PB sM10 pistol with muzzle loading barrel • H&R/New England Firearm Huntsman • Thompson Center Encore/Contender • Rossi .50 muzzle loading rifle This list is not complete and frequently changes. There may be other muzzle loaders also classified as firearms. As noted, any muzzle loading weapon that is built on a firearm frame or receiver falls within the definition of a firearm provided in 18 U.S.C. § 921(a)(3). "
