Check the listing for details. Ruger Mark IV 22/45 Lite Muzzle Brake/Compensator 22LR. Color: Silver, Condition: New. Listed at 34.99 USD. This is made using a manual mill and a manual lathe. I do all my machining myself so this truly made in America. It is machined to fit smooth on a Ruger Mark IV 22/45 Lite with the threaded barrel. It is made from 6061-T6 Aluminum and is tapped to 1/2-28 threads with a diameter of 1.000". It is 1-3/4" in over all length. The ports are machined back towards the barrel at 30 degrees. 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!