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Hi Howard, the caliber is .22lr. This is for any 1/2"x28 threaded .22LR pistol or rifle. The Tactical Solutions Compensators and performance compensators are designed to compliment TacSol Pac-Lite and Pac-Lite IV barrel upgrades for the Ruger Mark series and 22/45 pistols. The Pac-Lite Compensator features 360 degree ports to help reduce muzzle rise, while maintaining a clean, classy look that matches the contour of any 1 inches diameter barrel. Stay safe & have a great day!

Hi Howard and welcome. 22 Caliber is the designed diameter. Tactical Solutions PLCMPMB Pac-Lite Compensator Black Matte Aluminum with 1/2 in-28 tpi Threads for 22 LR Ruger Mark I, III, IV, II. It will fit any 1/2 x 28 threaded 22 caliber barrel. Cheers, stay safe and enjoy!

The TAC SOL (Tactical Solutions) Pac-Lite 1" Compensator is designed for .22 LR caliber firearms. It is a muzzle device specifically sized for .22 caliber pistols and rifles featuring a 1/2x28 thread pitch (commonly used on firearms like the Ruger Mark series and 10/22).

It's a muzzle device sized for .22 caliber pistols and rifles. It has a 1/2x28 thread pitch that's typically used on firearms like the Ruger 10/22.

22 caliber pistols such as the Ruger 22/45