Keith is 100% Correct.
In 1968 I was 30 years old & A member of the NRA. Their actions ""OPPOSING"" the 1968 Gun Control Act led me to cough up the funds to become a Life Member. It was shortly after this they became a Registered Lobbyist having realized that not being so had severely hampered their ability to oppose the recently passed legislation.
Back in 1934 their primary opposition had been to alert members to upcoming legislation, not to actively Fight it. They Absolutely did not Support either the NFA or the GCA.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra