922r was part of a bill passed in 1989 (?) that requires any imported semi-auto firearm with certain features (pistol grip, removable magazines, etc) to have a certain number of parts made in the USA, or, more accurately, limits the number of certain IMPORTED parts that can reside in a firearm, according to a list of said parts. http://www.tapco.com/section922r/I thought 922r only applied to building a gun? IE SBRing a pistol.