The original Ergo Grip developed by Steve Hines was the first truly ergonomic shooter focused grip for AR platform rifles. 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 Gapper for increased comfort. The ergonomically designed Ergo Grip fits AR/M4 rifles and features ergonomically correct finger grooves integrated rear upper extension supports the web of your hand superior Rhino Hide texture improves weapon control and it is virtually impervious to oils and solvents.