The LimbSaver Sharpshooter X-Ring Barrel De-resonator allows you to tune and minimize the barrel harmonics of your rifle, thereby improving accuracy. Every shooter knows that finding the most accurate ammunition for your rifle can be a difficult task. Simply adjusting the position of the X-Ring on the barrel to it's "sweet spot" allows the user to achieve sub-MOA (minute of angle) groups with factory ammunition. With the X-Ring, you can dramatically affect the accuracy of your rifle without the need to handload your own ammunition!