The Sharpshooter X-Ring is a unique barrel deresonator manufactured from NAVCOMA(R) that tunes the 5 main ballistic vibration waves that affect shot grouping. These waves include: expansion, torsion, standing, whip, and elongation. Each of these individual waves negatively affects the barrel and the Sharpshooter is specifically designed to control them. By reducing this energy and tuning the dampening characteristics to a specific location on the barrel, you can consistently control muzzle movement during lock-up time which translates to greater accuracy. Simply slide the X-Ring onto your barrel. Features Improves Accuracy Tightens Groups Dampens Barrel Whip Easy to Install Fits barrels with 1/2- to 7/8-inch diameters