Advanced Armament Co (AAC) AR-15 Pistol A3 Flat-Top Upper Assembly 300 AAC Blackout (7.62x35mm) 1 in 7" Twist 12.5" Barrel with KAC URX II Free Float Quad Rail Handguard, Blackout Flash Hider

Product #: 747633 AAC #: 102129 UPC #: 847128007630
$1,128.99
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Product Information

This Advanced Armament Corp. AR-15 Upper Receiver Assembly in 300 AAC Blackout is a pin-on, ready-to-shoot top end for use with any legally registered SBR or pistol AR-15 lower receiver. The Mil-Spec 4150 chrome moly vanadium steel barrel comes equipped with 1 in 7" twist rifling, M4 feed ramps, a low profile steel gas block, and is finished inside and out with a protective black nitride treatment for superior durability and corrosion resistance. The muzzle is threaded with a 5/8"-24 pitch for easy installation of a silencer, and is topped off with an effective AAC 51T Blackout flash hider.

The upper features a forged M4-style flat-top receiver onto which a Knight's Armament free floating URX II Quad Rail System is rigidly attached. The URX II creates a full length top rail surface when matched with the flat-top upper to accommodate almost any desired sighting arrangement, and incorporates a unique, integral flip up front sight that folds flat into the handguard when not in use. The heat-treated, full auto bolt carrier is finished in a slick Nickel Boron coating, and comes equipped with a properly-staked gas key and Carpenter 158 steel bolt assembly. The upper comes complete with 3 KAC rail panels to protect unused rail space from damage as well as the shooter's support hand from excess barrel heat.

This 12.5" 300 Blackout upper utilizes a pistol length gas system and is compatible with most subsonic and supersonic ammunition, with or without a sound suppressor 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.

Specifications:
  • Upper Receiver: A3 Flat-Top
  • Barrel Length: 12.5"
  • Barrel Contour: Medium
  • Barrel Material: 4150 Chrome Moly Vanadium Steel
  • Muzzle Thread Pattern: 5/8"-24
  • Chrome Lined: No
  • Barrel Finish: Black Nitride / Melonite
  • Twist Rate: 1 in 7"
  • Chamber: 300 AAC Blackout (7.62x35mm)
  • Bolt Carrier: Mil-Spec, Nickel Boron Finish
  • M4 Feed Ramps: Yes
  • Muzzle Device: AAC 51-T Blackout Flash Hider
  • Gas System Length: Pistol
  • Gas Block Diameter: 0.750"
  • Handguard: Knight's Armament URX II Quad Rail, Free Float
  • Sights: Flip-Up Front Sight Integral to URX II, No Rear
  • Extras: 3 Knight's Armament Rail Panels

Technical Information:
  • Suitable for use w/Subsonic or Supersonic loads, either Suppressed or Unsuppressed
  • Compatible w/standard AR-15 magazines, including Magpul Pmags (Not Included)


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