Hand-filling, ergonomic profile with finger grooves, palm swells, and many other features improves shooting comfort and accuracy. Grips feature SureGrip® texture that adds an overmolded, rubberized covering to the polymer body for a superior grip and added cushion. Aggressive Texture grip features a more exaggerated SureGrip® texture that allows for increased traction. Standard Grip is slightly thinner than the factory grip but with additional depth front to back. Non-slip surface and subtle finger grooves improve grasp and promote correct trigger finger position. Curved rear backstrap fills web of hand. Comes with mounting hardware and Gapper™. ERGO features: Unique design allows installation on both .556 and .308 AR/M4 lower receivers without a need for spacer inserts Ergonomically correct finger grooves Integrated rear upper extensions supports the web of your hand Superior SureGrip® texture improves weapon control, even while wearing gloves Virtually impervious to oils and solvents