Check the listing for details. Ruger 10/22 Muzzle Brake/Compensator .920" 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 10/22 or any rifle with a 0.920" barreland 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 0.920". 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 fit any barrel with 1/2-28 threads, but it may or may not fit "smooth" on the barrel depending on what your barrel diameter may be. If you know what diameter you need I can make them fit whatever size (diameter) you are looking for. As you can see by the pictures I offer them with the two grooves or completely smooth. You only are purchasing/receiving one comp for the listing price even though there are two shown in the picture. This is just to show the difference between the two groove version and completely smooth. Shoot me a message of which one you would like upon purchasing. 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!