I joined online the night I bought my m&p (december 15th) and got my packet about a week and a half ago. so just over 2 months. Honestly, I had forgotten I signed up and it was quite a nice surprise when it came in the mail.
When I bought my gun it came with a card, I think you can also join online. It took about a month or two to get a letter saying they received my app. Then they finally sent the packet about 2 more months later
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