From Guns.com:

The bill, the “No Backdoor Gun Control Act,” was introduced on Wednesday by U.S. Rep. Chip Roy, a Texas Republican, and co-sponsored by 23 other members of the GOP. The lawmakers say the reform is needed to ensure federal gun regulators couldn’t use the AOW section to violate Second Amendment rights – and would be especially important if other bills delete short-barreled rifles and short-barreled shotguns from the NFA.