AR 9mm Barrel Thread Protector Nut for 1/2"x36 Muzzle Threading, 0.712", Stainless Steel SKU: BTPR04S
Protects your 9mm 0.712" Barrels fore end threading when you have to remove your Muzzle Brake. Fits Standard 9mm Barrel threading 1/2"x36. Outer width is for standard barrels. Outside textured for easy hand tightening. Stainless Steel.