Adams Arms AR-15 A3 Competition Evo Mid Length Gas Piston Upper Assembly 5.56x45mm NATO 1 in 8" Twist 16" Fluted Barrel Stainless Steel with 12" Samson Evo Rail, Muzzle Brake

Product #: 615944 Adams Arms #: UA-16-M-CO-556 UPC #: 854262002254
$1,399.99

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Product Information

This Adams Arms EVO Competition Gas Piston Upper Assembly is chambered in 5.56x45mm NATO and comes ready to fire right out of the box after installation onto any AR-15 lower receiver. Designed to be the ultimate lightweight solution for competitive, recreational or hunting purposes, the EVO Ultra Lite trims weight wherever possible while still maintaining excellent accuracy, long term durability and high performance. It does this by combining a 16" fluted stainless steel barrel with 12" extended Samson Evolution Modular Free Floating Handguard and a low profile piston gas block. The shooter's preferred sighting arrangement is easily accommodated by a continuous top picatinny rail interface that runs from the rear of the forged A3 flat-top upper receiver to the low profile gas block, while both recoil and muzzle climb are efficiently handled by an effective Adams Arms Competition Compensator which is permanently affixed to the barrel. Additional features include a mid length gas system for a longer sight radius and smoother recoil impulse, complete bolt carrier group, charging handle assembly, one 4" modular rail section and two 2" rail sections.

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.


Technical Information:
  • Upper Receiver: A3 Flat-Top
  • Barrel Length: 16"
  • Barrel Contour: Medium, Fluted
  • Barrel Material: 416 Stainless Steel
  • Muzzle Thread Pattern: 1/2"-28
  • Chrome Lined: No
  • Barrel Finish: Matte Gray
  • Twist Rate: 1 in 8"
  • Chamber: 5.56x45mm NATO
  • M4 Feed Ramps: Yes
  • Bolt Carrier: 1-Piece w/Integral Piston Strike Face
  • Muzzle Device: Adams Arms Competition Muzzle Brake
  • Gas System Length: Mid, Short Stroke Piston Operated
  • Gas Block Diameter: 0.750"
  • Handguard: 12" Samson Evolution Rail, Free Float
  • Sights: None, Single Rail Gas Block
  • Weight: 5.58 lbs


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    Adams Arms AR-15 A3 Competition Evo Mid Length Gas Piston  Upper Assembly 5.56x45mm NATO 1 in 8" Twist 16" Fluted Barrel Stainless Steel with 12" Samson Evo Rail, Muzzle Brake
    Adams Arms AR-15 A3 Competition Evo Mid Length Gas Piston Upper Assembly 5.56x45mm NATO 1 in 8" Twist 16" Fluted Barrel Stainless Steel with 12" Samson Evo Rail, Muzzle Brake