AR pistols were legal to buy and own in all 50 states (some are more difficult than others for sure). However, with the legal drama over the ATF's rule 2021R-8F, which essentially seeks to eliminate the protections AR pistols had when using a stabilizing brace - the government agency is now looking to criminalize millions of Americans so that they can bully law abiding citizens into registering their guns while reaping the profits of people paying for the tax stamp.