ERGO Grip drop in grip replacements are a simple, ergonomic upgrade for your AR-15. The textured rubber grip ensures a soft, positive grip surface under all conditions, reducing fatigue, and improving comfort. The original ergonomically designed ERGO Grip fits all AR-15/M16 rifles. ERGO Grips are available in two materials, RIGID and SUREGRIP.Both materials feature the Rhino Hide texture. RIGID models are molded into a hard polymer grip for a firm feel while SUREGRIP models feature an overmolded rubber-like surface for a morepositive grip. Both grip styles are designed to help prevent fatigue and enhance weapon control. Each ERGO Grip comes with our patented GAPPER and uses existing grip hardware for installation.