Does the final rule reclassify AR-15 uppers, and are they now required to be marked with a serial number?

No. The AR-15 platform has been specifically addressed in the final rule and the lower receiver will remain the regulated receiver requiring the appropriate markings. Pursuant to the final rule, 27 CFR 478.12(f)(1)(i) “[t]he receiver is the lower part of the weapon that provides housing for the trigger mechanism and hammer (i.e., lower receiver).” for the AR–15/M–16 variant firearms.

Last Reviewed July 22, 2022