On September 27, 2022, the Bureau of Alcohol, Tobacco, Firearms and Explosives issued an open letter to all Federal Firearms Licensees. The letter is available online. The letter is seven pages long and includes several images. The purpose of the letter is explained in the first paragraph. From the atf.gov:The Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) is issuing this open letter to further assist the firearms industry and the public in understanding whether a “partially complete, disassembled, or nonfunctional” receiver of an AR-15/M-16 variant weapon has reached a stage of manufacture such that it “may readily be completed,...