ATI AR-15 .223/5.56 Muzzle Brake Jam Nut. CNC-machined from heat-treated steel, this muzzle brake jam nut is designed for the AR-15 modern sporting rifle system chambered in .223 Rem and 5.56x45mm. This jam nut fits over 1/2" x 28 TPI and features a corrosion-resistant black oxide finish. The jam nut installs behind the muzzle brake and locks it into the barrel in the proper position.
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