A number of people who wrote the Constitution and Bill of rights personally owned weapons capable of killing 30 people in one shot. Given that undeniable fact, I think they probably considered the possibility of someone having that sort of firepower.
$0 of an NRA membership goes to legislative action or court battles. Not a dime. Only money contributed to the NRA-ILA or NRA-PVF.
Of course, you could just donate to the Second Amendment Foundation
I was feeling pretty good, then I looked around and realized I am not swimming or on fire.