The ATF Issues an Open Letter on Polymer 80 Lowers
This video provides an expert breakdown from William Kirk of Washington Gun Law regarding the ATF's open letter on Polymer 80 and similar unfinished frames/receivers, effective August 24, 2022. The ATF now considers certain 80% lowers, particularly those with pre-milled critical areas, as completed firearms requiring a Form 4473, regardless of whether they were sold with a jig. This redefinition focuses on how 'readily' a part can be converted into a functional frame.










