Advanced Armament Co (AAC) AR-15 A3 Flat-Top Upper Assembly 300 AAC Blackout (7.62x35mm) 1 in 7" Twist 16" Barrel with KAC URX II Free Float Quad Rail Handguard, Blackout Flash Hider
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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 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 (7.62x35mm)
- 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 II Quad Rail, Free Float
- Sights: Flip-Up Front Sight Integral to URX II, No Rear
- Extras: 3 Knight's Armament Rail Panels
- Suitable for use with Subsonic or Supersonic loads, either Suppressed or Unsuppressed
- Compatible with all standard AR-15 magazines, including Magpul Pmags (Not Included)