Gemtech GMT-300, Rifle Suppressor, 300 Blackout, Weight 14 oz., 5/8-24 Thread, Sound Reduction: 36-39 dB, Full Auto Rated Black Cerakote Finish with Reduced Visual-IR 12119 GEMTECH's GMT-300BLK suppressor utilizes their patented G-Core technology. 300Blackout is a unique round that super and subsonic ammunition function differently in the same rifle. The suppressor is optimized for use with both super and subsonic ammunition in short barreled rifles. The GMT-300BLK, being a G-Core suppressor, is completely user serviceable.