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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 KAC URX rail is rigidly attached. The URX creates a full length top rail surface when matched with the flat-top upper to accommodate almost any desired sighting arrangement. 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. 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.
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
M4 Feed Ramps: Yes
Muzzle Device: AAC 51-T Blackout Flash Hider
Gas System Length: Pistol
Gas Block Diameter: 0.750"
Handguard: KAC URX rail
Bolt Carrier Assembly Included: Yes
Bolt Carrier Type: Mil-Spec, Nickel Boron Finish
Shipping to Lower 48 Only,
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Shipping to Lower 48 Only!!
Trades Accepted: No
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