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 5/8 additional length for better control and comfort. These units blend with the contours and texture of the handgun giving a factory appearance. They are made from High Impact Polymer and withstand drop tests at temperatures from -20 F to 350 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.