The Advanced Technology Int. X2 AR-15/AR-10 pistol grip fits most AR-15 and AR-10's. The X2 grip also fits the Ruger 22 Charger Pistol with AR-15 style grip. This pistol grip features a material that absorbs the initial shock wave which is the felt punch of the recoil. This increases the shooter's comfort while reducing the muzzle lift. Specifically Engineered Grip Dimensions Create the Optimal Distance from the Grip to the Trigger to Fit Most Hands. It is easy to install and uses original mounting hardware. The ATI AR-15 / AR-10 X2 Pistol Grip is designed to fit with a mil-spec locking ring. It will not fit with locking rings that have additional sling loops or QD Mounts. Made in USA.