The GM-22 uses a monolithic baffle design developed by GEMTECH and marketed a G-Core. It is end-user serviceable. The GM-22 attenuates sound 36-39 dB and is compatible with .22LR, .22WMR and .17HMR . It is full auto rated, 5” overall and a 1” tube. The silencer uses a 1/2-28 Ti Thread Insert for the mount. M.S.R.P. is $395