It depends on the gun.
Barrel length affects three thing:
You aren't worried about concealability at the range, so the longest barrel without the gun becoming unwieldy. Probably in the 4-6" range.
$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.