They can ‘ban’ whatever the like, but that won’t stop them from being manufactured or used.
They ban illegal drugs, and look how well that works..............
There are adapters available over the Internet which allow one ot use an oil filter as a sound suppressor. Frabkly, banning sound suppressors is not a constitutional issue so the 1934 regulations were unconstitutional and tacked onto the ban on full auto weapons by a socialist fed.