The Trump administration's Justice Department allowed a key provision of the National Firearms Act to lapse, marking a significant shift in federal firearms regulation.

The move effectively ended enforcement of a Prohibition-era requirement that mandated registration and taxation of certain firearms, including machine guns and short-barreled rifles. This regulatory gap represents one of the most substantial changes to federal firearms law in decades.

The decision came as part of a broader Justice Department retreat from pursuing new firearms restrictions, aligning with the administration's approach to reducing regulatory oversight. Legal experts note the lapse could have lasting implications for firearms policy and future legislative efforts.

The affected provisions had been in place since the 1930s, requiring extensive documentation and background checks for owners of specified weapons. The administrative lapse creates immediate uncertainty for law enforcement agencies and firearms dealers nationwide.