The ergonomically designed ERGO Grip fits all AR15 / M16 rifles with original grips and features: smooth textured finger grooves, integral rear upper extension supports the web of your hand, superior textured finishes minimize slippage even while wearing gloves, virtually impervious to oils and solvents, new improved rubber bottom plug with lanyard and battery storage compartment. SUREGRIP models feature an overmolded ruber hide that somewhat resembles the consistency of a pencil eraser and offers the user a grip with a little give. Each ERGO Grip comes with the patented GAPPER and can be installed using existing grip hardware.