Adams Arms AR-15 C.O.R. Ultra Lite A3 Gas Piston Upper Receiver Assembly 5.56x45mm NATO 16.5" Barrel Flip Up Sights

Product #: 396779 Adams Arms #: UA-16.5-R-EUL-COR-D45
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  • Information
The Adams Arms C.O.R. (Competition, Optics Ready) Upper Assembly is designed with the competitive shooter in mind. This complete upper assembly features a 16.5" barrel with a piston driven, rifle length gas system. A VDI Jet Comp combined with a low mass bolt carrier offers reliability with a minimal felt recoil impulse and negligible muzzle rise, allowing the shooter to get back on target quicker. Simply pin the C.O.R. upper to a complete AR-15 lower receiver, add an optic, and you're ready for the next 3 Gun Match!

The 12" Samson Evolution Handguard is a free float design to maintain accuracy. The included handstop and picatinny rail sections allow the rail to be customized for additional accessories, if desired, or left off for a sleek and lightweight competition gun. The Ultra Lite barrel offers match grade accuracy without adding any unnecessary weight. The Diamondhead flip up sights are set at a 45 degree angle. Push the button and the spring loaded sights snap into a 1 O'clock position, allowing the shooter to roll the weapon counter clockwise and quickly engage close targets. When not in use, the sights fold flat to stay out of the way.

All Adams Arms uppers feature a short stroke gas piston operating system, which prevents hot gas and debris from being directed back into the action upon firing. The result is a rifle that runs cooler, cleaner and more reliably than those utilizing a standard direct gas impingement system of operation. To ensure that damage doesn't occur to the buffer tube from carrier tilt, the bolt carrier is equipped with enlarged "skis" to help guide it into the receiver extension. The bolt carrier's solid steel, 1-piece construction incorporates an integral piston strike face to guarantee integrity over time, while the bolt assembly is spring loaded for proper lock-up and to help reduce bolt bounce and cam pin wear. All piston components are finished in QPQ Melonite for corrosion resistance and easy cleaning/maintenance.

Technical Information

  • Upper Receiver Type: A3 Flat-Top, Forged
  • Barrel Length: 16.5"
  • Barrel Contour: Ultra Lite
  • Barrel Material: 4150 Chrome Moly Vanadium Steel
  • Muzzle Thread Pattern: 1/2"-28
  • Chrome Lined: No
  • Barrel Finish: VooDoo Innovations LifeCoat
  • Twist Rate: 1 in 7"
  • Chamber: 5.56x45mm NATO
  • M4 Feed Ramps: Yes
  • Muzzle Device: VooDoo Innovations Jet Compensator
  • Gas System Length: Rifle, Short Stroke Piston Operated
  • Gas Block Diameter: 0.750"
  • Handguard: 12" Samson Evolution Free Float Customizable
  • Sights: Diamondhead D45 Swing Sights
  • Bolt Carrier Assembly Included: Yes
  • Bolt Carrier Type: 1-Piece w/Integral Piston Strike Face, Low Mass, weighing 7.5 oz
  • Extras: 2x 2" Picatinny Rail Sections, Handstop

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.

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