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MEC-GAR +2 ADAPTER (NOT SHIPPED TO RESTRICTED STATES) F42099-SET
[F42099-SET +2 POLYMER BASE MAGS]

$10.95

These fit my M&P 9 and M&P 40 full-size magazines and work fine. To ensure a good "click" of the magazine catch, I sanded a little off the top (e.g., the part that touches the bottom of the grip, when inserted). Bottom line, these are a neat way to add two rounds to the 17 round M&P 9 magazine, making it a 20 rounder, with little overall dimensional gain -- and at a reasonable price! Thanks!
Date Added: 11/23/2013 by Dennis Renken