NRA Magazine Mailing Label
(ID begins in position 6 and is 10 digits long)
Example, underline and color added to member number: #0790101234567895#F* LIFE
See it here on the NRA site:
BTW, don't worry if you wrote the whole thing down, they know how to decode it at NRA HQ. Also don't worry if you sent me the "old" style number. They have links from your old number to your new number.