We have a new video out showing the Griffin Armament M4SDK. The M4SDK is the M4SD-II’s shorter variant, designed for end users who require minimal size and weight gain. The M4SDK is quick attach and compatible with A2 flash hiders as well as Griffins own muzzle device line. The mounting system and mounts of the M4SD sound suppressor series are precision ground to ten thousandths of an inch repeatable and utterly dependable point of impact shift. The silencer ships with Griffin's Hammer Comp.