AR-15 BULL Barrel Thread Protector Nut for 1/2 INx28tpi Muzzle Threading, Black Carbon Steel. Model:: BTPR03
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 INx28. Outer Diam: 0.915 IN
Outer width is for bull barrels, not standard barrels. Outside textured for easy hand tightening.