The Strike Industries Extended Magazine Plate For GLOCK G17 9MM / G22 .40CAL was designed to provide smoother magazine reloading through a slow drag / no snag design while maintaining maximum magazine capacity with any OEM GLOCK magazine. The Extended Magazine Plate provides an additional 6 rounds to any G17 GLOCK magazine in addition to adding plus 5 to any G22 .40 cal magazine. Included is our special steel locking plate. Compared to other magazine extension plates on the market, our steel locking plate features a hook design which adds extra locking security to increase the durability of your magazine & extended magazine plate when fully loaded with rounds. Our extended Mfg: Strike Industries