I went to their web site, found the little check box (it was near the bottom left corner when I saw it) that said I could opt out of all mailings. I actually fell for that and checked the box. I do not get any mailings from the NRA.
I also check the box saying I don't want a clip magazine. Imagine my consternation when nothing appears each month.
I have other concerns, complaints and gripes about them, but being unindated with notices that I could renew 20 years ahead of my membership expiration, or to send money before <evil untoward event> is foisted on the gun community by <evil people>.
stay safe.