Large, single chamber compensator with six separate ports gives controlled release of muzzle gas for almost recoil-free rimfire shooting. Inner, rubber O-ring gives a positive gas seal. Installs easily by removing factory front sight and using existing hole. Weighs 4oz. Fits Ruger Mark 2 and 22/45 models with .875" bull barrel (4", 5-1/2", or 6-7/8"). It does not fit the 10" model.
Ruger MKII and 22/45 models with .875" bull barrel (4", 5.5", 6.875"). It will not fit the 10" barrel
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