The Original ERGO Grip, designed for performance by creating a better interface between the shooter and firearm, the ERGO Grip is still the standard by which positive grip and shooter comfort are measured. The ERGO Grip comes with the proprietary Gapper for increased comfort. The 4009 comes with the Aggressive Texture (AT) that increases traction. Fits AR-15 type firearms in .223 and .308 Ergonomically correct finger grooves Integrated rear upper extension supports the web of your hand Aggressive texture improves weapon control Virtually impervious to oils and solvents Overmolded SUREGRIP material provides non-slip grip ERGO SURE GRIP rubber texture Comes with The Gapper, Plug, and Hardware Pack Includes Installation Hardware Pack