Precision Armament 1/2X28 to 5/8X24 Muzzle Thread Adapter (M4ADP-1) allows 5/8-24 muzzle-devices to attach to 1/2-28 threading parts. Wrench flats on shoulder make installation and removal for use on multiple devices simple and easy. Both Internal and external threads are single point cut in same operation to tight UNEF Class-3 tolerances for perfect concentricity and alignment. Compact design moves muzzle device only .100” forward maintaining full thread joint strength. The M4 muzzle thread adapter is precision CNC machined from pre-hardened HTSR 400-series stainless steel bar for superior heat and corrosion resistance.