Home/American Shipper/ATF proposes to narrow bump stock registrations American Shipper ATF proposes to narrow bump stock registrations FreightWaves Staff · Thursday, March 29, 2018 Facebook Twitter/X LinkedInThe Alcohol, Tobacco, Firearms, and Explosives Bureau proposed a rulemaking that would classify bump stocks as machineguns, and narrow bump stock registrations to importers, manufacturers and gunmakers. N/A