Advanced Armament Co (AAC) AR-15 Pistol A3 Flat-Top Upper Assembly 300 AAC Blackout 1 in 7" Twist 9" Barrel with KAC URX III Modular Free Float Quad Rail Handguard, Blackout Flash Hider
- Sierra Matchking Bullets 300 AAC Blackout (308 Diameter) 125... $38.49 - $176.99 Select Options
- Lee Pacesetter 3-Die Set 300 AAC Blackout... $34.99 Available
- Lee Case Length Gage and Shellholder 300 AAC Blackout... $5.19 Available
- Lee Factory Crimp Die 300 AAC Blackout... $13.29 Available
- Geissele Super Semi Automatic Trigger AR-15, LR-308 Small Pin... $210.00 Available
- ACE Improved Pistol Receiver Extension Buffer Tube Assembly... $67.99 Available
- Remington Premier Match Ammunition 300 AAC Blackout 125 Grain... $31.49 Available
- Remington Reloading Brass 300 AAC Blackout Primed... $27.99 - $133.99 Select Options
- Hornady Custom Ammunition 460 S&W Magnum 200 Grain Flex Tip... $29.99 Available
- C Products Defense Magazine AR-15 223 Remington with Orange... $11.58 - $15.29 Select Options
- Hornady LEVERevolution Bullets 45 Colt (Long Colt) (452... $30.99 Available
- Hornady LEVERevolution Bullets 460 S&W (452 Diameter) 200... $28.99 Available
- Hornady A-Max Bullets 30 Caliber (308 Diameter) 208 Grain Boat... $35.99 Out of Stock, Backorder OK
- ProMag Magazine FN Five-seveN 5.7x28mm FN Polymer Black... $29.49 - $40.49 Select Options
- Frankford Arsenal Impact Bullet Puller... $15.49 Available
- Advanced Armament Co (AAC) Brakeout Flash Hider Muzzle Brake... $98.99 Available
- Lee 2-Cavity Bullet Mold TL309-230-5R 30 Caliber (309... $19.67 Available
- Timney Trigger AR-15 Small Pin .154" Single Stage ... $223.99 - $279.99 Select Options
- Hornady A-Max Bullets 30 Caliber (308 Diameter) 155 Grain Boat... $29.49 Select Options
The upper features a forged M4-style flat-top receiver onto which a Knight's Armament free floating URX III Modular Rail System is rigidly attached. The URX III creates a full length top rail surface when matched with the flat-top upper to accommodate almost any desired sighting arrangement. This customizable handguard allows shooters to attach modular rail sections along its length only where needed for adding accessories, keeping the remainder of the handguard slim, smooth, and snag-free. 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 9" 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: 9"
- 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
- 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 III Modular Rail, Free Float
- Sights: None
- 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: 4.200 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.
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