The Tactical Solutions Pac-Lite Compensator are designed to compliment TacSol Pac-Lite Barrel upgrades for the Ruger Mark I, II or III, Ruger 22/45, Ruger Mark IV or Mark IV 22/45 and other 1" barrels. The Pac-Lite Compensators feature 360 degree ports to help reduce muzzle rise, while maintaining a clean look that matches the contour of any 1" target barrel. The compensators thread on to 1/2" x 28 threaded-end barrels.