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Tim, Ruger lists this muzzle device as a Adjustable harmonic dampener. Ruger does not post a lot of info on it so I would ask Ruger Customer Service directly at Telephone: 336-949-5200 / (Monday through Friday 8:00am - 5:00pm ET)

Adjustable Harmonic Dampener which is a weight that you move forward or backwards to get the best group with the round you are shooting you would have to ask ruger how it is attached Telephone: 336-949-5200