Enables attachment of FA68AR suppressor to any 6.8 Rem. SPC rifle or carbine with 5⁄8−24 muzzle threads and (due to overlap design) first 2.75″ of barrel (measured from muzzle back) clear of obstructions and no more than .749″ in diameter. This adapter functions alone as a high-performance muzzle brake when the suppressor is removed. Patented design greatly diffuses side blast, counteracts up/right muzzle movement to keep muzzle on target, eliminates felt concussion on shooter. Heat-treated stainless steel construction.