24 Jun 2022 1:11 pm
Nice find on the AR15 auto-sear. The one I posted about is for an FN FNC. Yes, you can modify the lower receiver by drilling a hole in it to install the registered auto-sear. You can do this in an FNC, because only the FNC upper receivers are the serial numbered part, making the upper receiver the "gun". So ATF will allow mods to the lower receiver to accept the FNC sear.Huey » 24 Jun 2022, 9:23 am » wrote: ↑ 27 CFR 179.11: MEANING OF TERMS
The AR15 auto sear is a machinegun as defined by 26 U.S.C. 5845(b). ATF Rul. 81-4 [Status of ruling: Active] The Bureau of Alcohol, Tobacco and Firearms has examined an auto sear known by various trade names including “AR15 Auto Sear,” “Drop In Auto Sear,” and “Auto Sear II,” which consists of a sear mounting body, sear, return spring, and pivot pin. The Bureau finds that the single addition of this auto sear to certain AR15 type semiautomatic rifles, manufactured with M16 internal components already installed, will convert such rifles into machineguns. The National Firearms Act, 26 U.S.C. 5845(b), defines “machinegun” to include any combination of parts designed and intended for use in converting a weapon to shoot automatically more than one shot, without manual reloading, by a single function of the trigger. HELD: The auto sear known by various trade names including “AR15 Auto Sear,” “Drop In Auto Sear,” and “Auto Sear II,” is a combination of parts designed and intended for use in converting a weapon to shoot automatically more than one shot, without manual reloading, by a single function of the trigger. Consequently, the auto sear is a machinegun as defined by 26 U.S.C. 5845(b). With respect to the machinegun classification of the auto sear under the National Firearms Act, pursuant to 26 U.S.C. 7805(b), this ruling will not be applied to auto sears manufactured before November 1, 1981. Accordingly, auto sears manufactured on or after November 1, 198
https://www.atf.gov/resource-center/doc ... f/download
BTW, the bolt carrier needs to be modified as well or it won't work. All legal, as long as the autosear is registered.