.223 /5.56 thread
protector will protect your threads if you plan on going without a muzzle
brake/device on your rifle.CNC
Machined High Quality SteelHeat
1/2" Long x 5/8" Diameter..
shims fit between the barrel nut and upper receiver to allow adjustment
between the receiver and features like swivel studs, vent openings,
picatinny rails, etc.Pack of 10Size: 0.32mmWill fit .223, 7.62x39, Blackout AAC 300..