The New LimbSaver® Barrel De-Resonator is designed to dampen out unwanted vibration by shortening the overall settling time of the barrel. The accuracy benefit is immediate, providing sub-minute angle groups with over-the-counter factory ammunition. This easy-to-install unit simply slips over most standard barrels. Designed and manufactured with our proprietary NAVCOM™ (Noise and Vibration Control Material), and engineered for optimum performance utilizing Sims Vibration Laboratory’s DTMS (Decay Time Modification System).  .45″ inner diameter (for 1/2″-7/8″ sporter barrels).