A truly ergonomic, shooter focused flat top grip for AR platform rifles and chassis systems. 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 patented Gapper(TM) for increased comfort. Includes Installation Hardware Pack Heavy textured overmolded SUREGRIPA(R) gives you the comfort and control necessary for precision shooting. The grip used by the ATF - Bureau of Alcohol, Tobacco, Firearms and Explosives Design allows installation on both .223 and .308 AR-15 type lower receivers. Fits modern chass Mfg: Ergo Grips