Enables attachment of FA68K suppressor to any 6.8 Rem. SPC semi-auto or bolt-action rifle with 5⁄8−24 muzzle threads and (due to slight overlap) first .170″ of barrel behind threads clear of obstructions and no more than .800″ in diameter. This adapter functions 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.