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 .308Ergonomically correct finger groovesIntegrated rear upper extension supports the web of your handAggressive texture improves weapon controlVirtually impervious to oils and solventsOvermolded SUREGRIP material provides non-slip gripERGO SURE GRIP rubber textureComes with The Gapper, Plug, and Hardware PackIncludes Installation Hardware Pack