AAC 300 Blackout 9" AR Barrel Assembly w/Gas Block & Tube

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  • Regular price $569.99

Part #: AAC-101718 Brand: Advanced Armament Corp

This Advanced Armament Co (AAC) AR-15 Pistol Barrel Assembly is perfect for the shooter who wishes to build or convert an AR-15 to chamber the new 300 AAC Blackout round in order to take advantage of its unique ballistic characteristics. The barrel is finished inside and out with a highly durable and corrosion resistant Black Nitride, a treatment that produces an extremely hard, slick surface on the steel that resists carbon adhesion for easier cleaning and maintenance. The Nitride process converts the steel's surface without any build-up, retaining all of the benefits of traditional chrome lining without suffering the accuracy degradation commonly encountered with it due to the uneven application of chrome inside a barrel's bore.

The 9" and 12.5" barrel each feature a 1 in 7" twist and is threaded 5/8"-24 at the muzzle. These barrels include the 51T Flash Hider designed to effectively eliminate muzzle flash and works in conjunction with AAC's improved ratchet mount sound suppressors. It utilizes a pistol length gas system and is compatible with most subsonic and supersonic ammunition, with or without a silencer in place. However, some subsonic ammunition may not always cycle reliably under adverse conditions or in a severely fouled firearm without a sound suppressor attached to provide extra backpressure. Barrel assembly includes a pistol gas tube, low profile steel gas block, barrel extension and locator pin. Requires barrel nut for installation (not included).


  • Material: 4150 Chrome Moly Vanadium Steel
  • Contour: Medium
  • Chamber: 300 AAC Blackout
  • Twist Rate: 1 in 7"
  • Chrome Lined: No
  • Finish: Black Nitride / Melonite
  • M4 Feed Ramps: Yes
  • Muzzle Thread Pattern: 5/8"-24
  • Gas Port Location: Pistol
  • Exterior Diameter at Gas Port: 0.750"
  • Extras: Low Profile Gas Block, Gas Tube, 51T Flash Hider
  • Additional Info: Suitable for use w/Subsonic or Supersonic loads, either Suppressed or Unsuppressed

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