Some are antiques also.
I know they are legal and it has something to do with their age.
If they lack the stock I believe it can be replaced with one meant to look like the original without voiding the C+R classification.
$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.