The ERGO AR Grip is uniquely designed to allow installation on both AR-15 and AR-10 style receivers without the need for spacers. The A2 sized inner cavity is compatible with many accessories available on the market. Ergonomically correct finger grooves and an integrated rear upper extension supports the web of your hand. Superior SUREGRIP texture improves weapon control, even while wearing gloves. Features: The ergonomically designed grip fits the contour of the hand, rear upper extension supports the web of the hand Grip surface has the texture and feel of rubber with the strength of a rigid grip Grip includes Gapper Mounting Hardware NOT included Virtually impervious to oils and solvents. For the best selection of Modern Sporting Rifles parts and accessories, shop Palmetto State Armory!