Increases the grip length of the Sub Compact Glock AutoPistols with out increasing their capacity; Blends with the contours and texture of the handgun giving a factory appearance; Made from High Impact Polymer and withstand drop tests at temperatures from -20 F to 350 F; Forms 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; Black Finish