GEMTECH's GMT-300BLK suppressor utilizes our 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 barrelled rifles. The GMT-300BLK, being a G-Core suppressor, is completely user serviceable.For Barrels: 7.5" or longer 300 BLKSpecificationsCaliber.30Sound Tested124dB Smith & Wesson(R) M&P(R)15 300BLK 16" | 129dB Daniel Defense(R) DDM4300S 10.5"Diameter1.5"Overall Length6.7"Weight14.0 oz.Mount Type5/8-24 ThreadsTube MaterialTitaniumFull Auto RatedYesTube FinishBlack High-Temperature Cerakote(R)