Pearce Grip's Grip Extension is a replacement the magazine base plate, but retains all other factory components. It does not alter the capacity of the magazine and is made from high impact polymer. The extension will add 3/4" additional length resulting in better control and comfort. Also, it provides magazine identification via Mag-Track for those that rotate magazine usage.These units replace the magazine base plate and retain all other factory components. They do not alter the capacity of the magazine. These units will add 1 inches additional length resulting in better control and comfort. Features: These units increase the grip length of the sub compact Glock auto pistols with out increasing their capacity These units blend with the contours and fourth generation texture of the handgun giving a factory appearance They are made from high impact polymer and withstand drop tests at temperatures from -20 to 350 deg F They form the next logical finger positioning feature to provide control and comfort without sacrificing conceal ability Provides magazine identification via Mag-Track for those that rotate magazine usage