“MPA MPA57SSTGR 5.7x28mm 5″” TB 20+1 Grim Reaper Coating All components are produced and assembled in the USA the majority of which is done at their facility just outside of Atlanta, GA. The following parts are produced from solid steel blocks or round bar steel stock. Pistol 5.7x28mm comes with one (1) 20 round polymer magazine, one (1) muzzle brake, side cocker, scope mount. It has a semi auto design with a 5″” or 8″” barrel. Thread size – 1/2×28. “