Adams Arms AR-15 A3 Base Carbine Gas Piston Upper Assembly 5.56x45mm NATO 1 in 7" Twist 16" Barrel Melonite Finish with M4 Handguard, Flash Hider

Product #: 674968 Adams Arms #: UA-16-C-B-556 UPC #: 854262002667
$639.00
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Product Information

This Adams Arms AR-15 A3 Base Carbine Gas Piston Upper Assembly is chambered in 5.56x45mm NATO and comes ready to fire right out of the box after installation onto any standard AR-15 lower receiver. This Base Carbine upper comes equipped with a 16" melonite-finished barrel, A2 flash hider, bolt carrier group, charging handle, picatinny rail gas block, delta ring assembly and a set of polymer M4-style handguards. Additional features include a forged A3 flat-top configuration that's ready to accept the shooter's choice of optic and/or rear iron sight, M4 feed ramps to help ensure reliable feeding and functioning during rapid strings of fire, and a carbine length gas system.

The upper's barrel has been finished inside and out with Adams Arms' proprietary QPQ Melonite treatment that bonds with the metal on a molecular level. Also referred to as salt bath nitriding, this treatment produces an extremely hard, slick surface on steel that resists carbon adhesion and increases corrosion resistance, extending a barrel's service life by reducing the friction produced inside the bore upon firing for a net decrease in bore surface wear over time. Nitriding converts the barrel steel's surface without any build-up, retaining all of the benefits of traditional chrome lining without suffering the accuracy degradation commonly encountered due to uneven application of chrome inside the barrel's bore. The end result is a barrel that's capable of producing accuracy on par with a match stainless steel tube, while also exhibiting the longevity and resilience of a chrome lined, mil-spec barrel.

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.

Specifications:
  • Upper Receiver: A3 Flat-Top, Forged
  • Barrel Length: 16"
  • Barrel Contour: M4
  • Barrel Material: 4150 Chrome Moly Vanadium Steel
  • Muzzle Thread Pattern: 1/2"-28
  • Chrome Lined: No
  • Barrel Finish: QPQ Melonite / Black Nitride
  • Twist Rate: 1 in 7"
  • Chamber: 5.56x45mm NATO
  • M4 Feed Ramps: Yes
  • Bolt Carrier: 1-Piece w/Integral Piston Strike Face
  • Muzzle Device: A2 Flash Hider
  • Gas System Length: Carbine, Short Stroke Piston Operated
  • Gas Block Diameter: 0.750"
  • Handguard: 2-Piece Polymer M4-Style
  • Sights: None, Single Rail Gas Block
  • Weight: 4.23 lbs


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