Check the listing for details. RPR 10/22 Ruger American Muzzle Brake/Compensator .860" O.D. 1/2-28 22LR. Color: Silver, Condition: New. Listed at 44.99 USD. This is made using a manual mill and a manual lathe. I do all my machining myself so this truly made in America. As pictured it fits smooth on a Ruger Precision Rimfire and Ruger American or any rifle with a 0.860" barrel and will work with the 17HMR, 22LR, & 22WMR. It is made from 6061-T6 Aluminum and is tapped to 1/2-28 threads. It is 2-1/4" in over all length with a diameter of 0.860". The ports are machined back towards the barrel at 30 degrees. The target pictured was at a distance of 50 yards using CCI standard Velocity rounds. The left side of the target was without the brake and the right side was with. I did this test to prove that this break does not decrease accuracy. This will also work the 22mag and 17hmr versions. If you have any questions or need more information do not hesitate to ask! Item is sold as is. No refunds or returns of any kind! USA shipping ONLY!! Thanks for looking!