SI Defense Barrel AR-15 5.56x45mm NATO 16" HBAR Contour 1 in 8" Twist Matte

Product #: 889075 SI Defense #: SI AR-15-B-HBAR-556-16
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  • Information
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.

Technical Information:
  • Barrel Length: 16"
  • Material: 4140 Chrome Moly Steel
  • Twist Rate: 1 in 8"
  • Chamber: 5.56x45mm NATO
  • Contour: HBAR
  • M4 Feed Ramps: Yes
  • Chrome Lined: No
  • Gas Port Location: Carbine
  • Barrel Diameter at Gas Port: 0.750"
  • Muzzle Thread Pattern: 1/2"-28
  • Finish: Mil-Spec Heavy Phosphate
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