X-Grip Magazine Adapter for S&W M&P 9mm, 357 Sig, 40 S&W Full Size Magazine to fit M&P Compact Models Polymer Black

The patent pending X-GRIP adapts the full-size M&P 15 or 17 round magazines for use in the compact pistol, incorporating the larger magazine into the compact's grip, increasing the capacity by 5 additional rounds of ammunition. Compatible with 9mm, 40 S&W, and .357 Sig magazines and pistols.