The president isn’t allowed to amisty anymore because of 922(0) 1986 was the cut off date. No machine guns will be registered after that. The elected congress knows better than to repeal the NFA. The gangster guns were banned because of their widespread use by criminals prior to 1934. Including short barrel shotguns used by people like Clyde barrow. They just outgunned police or paid them off. (north Hollywood shootout) You now you have criminals who don’t want anything they just kill as many people as possible with the best weapons they can get. They won’t ever pass a bill allowing it or other NFA weapons.