The final rule defines “bump-stock-type devices” as “machineguns” under the National Firearms Act of 1934 and the Gun Control Act of 1968 “because such devices allow a shooter of a semiautomatic firearm to initiate a continuous firing cycle with a single pull of the trigger.” That understanding of the law contradicts the plain language of the NFA, the position repeatedly taken by the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF) during the Obama administration, and the interpretation endorsed by both supporters and opponents of a legislative ban.