Strange, I've never gotten one piece of junk mail from the NRA since I called them and asked to be taken off the junk mail list. Only the magazine and voting guides ever since.
I guess that's only if you can figure out what this means:
Q: How can I reduce the amount of mail I receive from the NRA?
A: Simply email us at email@example.com
or dial 800-NRA-3888 and request to be placed on the "Do Not Promote" list. This will significantly reduce the amount of mail you receive without affecting important mailings, magazine service, or your membership renewal.
Note, even if you don't particularly like the NRA join. They're the only ones that is spoken of in "the gun lobby" tones by all the media and the Brady Campaign so they're the only ones the anti groups are actually afraid of. In addition to the NRA, consider SAF, Second Amendment Sisters, JPFO, etc.