Since I have some laying around, I thought I'd try some skateboard deck tape. It's thin, really grippy, and sticks like crazy. I can also put it exactly where I want it, and it's pretty easy to cut to shape. This is what I ended up w/ at first. I put 100 rds through it last night and am pretty happy w/ it so far.

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LE6920 M&P 15-22 M&P 9 10-22TD