Advanced Armament Co (AAC) AR-15 Pistol A3 Upper Receiver Assembly 300 AAC Blackout 12.5" Barrel
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. 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.
- 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
- Sights: None
- Bolt Carrier Assembly Included: Yes
- Bolt Carrier Type: Mil-Spec, Nickel Boron Finish
- Suitable for use w/Subsonic or Supersonic loads, either Suppressed or Unsuppressed
- Compatible w/standard AR-15 magazines, including Magpul Pmags (Not Included)
Please Note: An “AR-15 Pistol” upper assembly has a barrel less than 16” in length. Pistol uppers are only for use on AR-15 pistol lowers and legal Short-Barreled Rifles. Other configurations may violate Federal law.
Please Note: Installation of AR-15 upper assemblies with certain features including, but not limited to: flash hiders, bayonet lugs, and threaded muzzles may violate state and/or local laws.
Shipping Weight: 5.150 PoundsXThe total weight of the product, including the product’s packaging as it sits on our shelf. Since some products ship directly from the Manufacturer, their weight may be unavailable. Because of variations in the manufacturing process, similar products may have differing weights. Unless the product is designated as “Ships Alone”, Shipping Weight does not include the shipping box or packing materials associated with your order.
XProduct ships from MidwayUSA, separate from any other products on your order due to its size. Products that are Shipped Alone incur separate "Per Order" and "Per Pound" shipping charges.
XProduct is regulated by the US Department of Transportation (DOT) and cannot be shipped via USPS or air shipping methods. DOT-Regulated products must ship UPS Ground.
XProduct is restricted by shipping carriers and cannot be shipped to certain locations or via certain shipping methods.
XAdditional shipping charge for HazMat products. Carriers charge extra to ship packages with products they consider hazardous, such as reloading powder and primers.
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