Advanced Armament Co (AAC) AR-15 A3 Flat-Top Upper Assembly 300 AAC Blackout 1 in 7" Twist 16" Barrel with KAC URX 3.1 Free Float Quad Rail Handguard, Blackout Flash Hider
- Lee Pacesetter 3-Die Set 300 AAC Blackout... $34.99 Out of Stock, Backorder OK
- Lee Factory Crimp Die 300 AAC Blackout... $13.29 Available
- Remington Reloading Brass 300 AAC Blackout Primed... $27.99 - $133.99 Select Options
- Lee Case Length Gage and Shellholder 300 AAC Blackout... $5.19 Available
- Geissele Super Semi Automatic Trigger AR-15, LR-308 Small Pin... $210.00 Out of Stock, Backorder OK
- Hornady Match Ammunition 50 BMG 750 Grain A-Max Boat Tail Box... $60.99 Out of Stock, Backorder OK
- Magpul PMAG M2 MOE Magazine AR-15 223 Remington 30-Round... $12.30 - $13.25 Select Options
- Gorilla Ammunition 300 AAC Blackout 125 Grain Sierra MatchKing... $26.99 - $269.90 Select Options
- Berger 1st Edition Reloading Manual... $23.29 Available
- Wilson Combat Quick Detachable Front Sight AR-15 Steel Matte... $117.99 Available
- Nosler "Reloading Guide #7" Reloading Manual... $15.77 Available
- Wilson Combat Quick Detachable Rear Sight AR-15 Steel Matte... $142.99 Available
- ProMag Magazine AR-15 223 Remington 5-Round Flush Fit Steel... $18.99 Out of Stock, Backorder OK
- PNW Arms Ammunition 300 AAC Blackout 147 Grain Full Metal... $19.49 Out of Stock, Backorder OK
- Magpul PMAG M3 Magazine AR-15 223 Remington Black... $13.25 - $18.95 Select Options
- Adams Arms AR-15 A3 Evo Ultra Lite Carbine Gas Piston Upper... $969.95 Available
- Daniel Defense AR-15 DDM4v1 LW A3 Flat-Top Upper Assembly... $1,199.00 Available
The upper features a forged M4-Style flat-top receiver onto which a Knight's Armament free floating URX 3.1 Quad Rail System is rigidly attached. 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 16" 300 Blackout upper utilizes the versatile carbine length gas system, a good choice for this cartridge if various weights and types of ammunition are to be used. Most subsonic and supersonic loads, fired from either a suppressed or unsuppressed gun, are compatible with this configuration. 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: 16"
- 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
- Bolt Carrier: Mil-Spec, Nickel Boron Finish
- Muzzle Device: AAC 51-T Blackout Flash Hider
- Gas System Length: Carbine
- Gas Block Diameter: 0.750"
- Handguard: Knight's Armament URX 3.1 Quad Rail, Free Float
- Sights: None
- Suitable for use with Subsonic or Supersonic loads, either Suppressed or Unsuppressed
- Compatible with all standard AR-15 magazines, including Magpul Pmags (Not Included)
- 5.32 lbs
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.