AR-15 Barrel Thread Protector Nut for 1/2"x28 Muzzle Threading, Black SKU: BTPR01
Protects your Barrels fore end threading when you have to remove your AR-15's Muzzle Brake. Fits Standard AR-15 Barrel threading 1/2"x28. Outer width is for standard barrels, not Bull barrels. Outside textured for easy hand tightening.