Another NRA myth is that they protect 2nd Amendment rights. In reality the NRA has been responsible for the worst gun control legislation in the last 80 years. NFA, GCA, and 922(o) were supported by the NRA leadership and I’ve never heard them apologize for it.
The NRA wasn’t much of a political organization at the time of the NFA (1934) and the GCA (1968). Plus, in the face of the 1920’s Prohibition lawlessness and 1930’s rural bank robbers, and two political assassinations that were highly played up, how much could they have done at the time?
If 922(o) refers to the ban on further registration of machine guns, that was attached via a voice vote of dubious legality. The rest of the FOPA that it was stuffed into did a lot of good.