The deadline for the public to submit comments on proposed rulemaking by the Bureau of Alcohol, Tobacco, Firearms and Explosives is this Thursday night, the Federal Register advises . At issue is a revised” interpret[ation of] the statutory definition of ‘machinegun’ in the National Firearms Act of 1934 and Gun Control Act of 1968 to clarify whether certain devices, commonly known as ‘bump fire’ stocks, fall within that definition.