SI Defense HBAR barrels are made from 4140 chrome moly steel and use button rifling. The barrel is chambered in 5.56x45mm NATO with a 1 in 8" twist. The twist and chamber of this barrel works with a wide variety of ammunition, including military surplus. The HBAR profile is heavy under the handguard and .750" at the gas block to the muzzle. The muzzle is threaded 1/2"-28 to accept muzzle brakes or flash hiders. The barrel is finished with a mil-spec manganese phosphate finish.
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