1/2″ x 28 is a common barrel thread pattern used primarily on AR-15 and other .223/5.56 caliber barrels. This threading allows for the attachment of muzzle devices such as flash hiders, compensators, muzzle brakes, and suppressors. It is compatible with most standard AR-15 barrels. As well as some 9mm barrels, and widely used for custom builds and upgrades, providing versatility and easy installation of various muzzle accessories.
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