Brownells Dead Air Sandman Keymount compatible Muzzle Devices Combining one of the popular suppressor adapter mounts, with tried-and-true flash hider configurations, the Brownells Keymount compatible muzzle devices / flash hiders are the perfect fit on a variety of suppressor host firearms. Users can select from the classic A2 or AR-180/BRN-180 flash hider configurations, both with closed bottoms to prevent dust & debris kick up, as well providing excellent flash hiding characteristics. Designed to bring a 13.7 inch barrel to a legal 16 inch overall length when pinned and welded.The rear of the device has been lengthened, in order to provide a larger working surface for pinn Mfg: Brownells