Technical Information

Upper Receiver: A3 Flat-Top, Forged

A3 Flat-Top, Forged Barrel Length: 16"

16" Barrel Contour: Government

Government Barrel Material: 4150 Chrome Moly Vanadium Steel

4150 Chrome Moly Vanadium Steel Muzzle Thread Pattern: 1/2"-28

1/2"-28 Chrome Lined: No

No Barrel Finish: QPQ Melonite / Black Nitride

QPQ Melonite / Black Nitride Twist Rate: 1 in 7"

1 in 7" Chamber: 5.56x45mm NATO

5.56x45mm NATO M4 Feed Ramps: Yes

Yes Muzzle Device: A2 Flash Hider

A2 Flash Hider Gas System Length: Mid, Short Stroke Piston Operated

Mid, Short Stroke Piston Operated Gas Block Diameter: 0.750"

0.750" Handguard: 2-Piece Magpul MOE, Mid-Length, Black

2-Piece Magpul MOE, Mid-Length, Black Sights: None, Single Rail Gas Block

None, Single Rail Gas Block Bolt Carrier Assembly Included: Yes

Yes Bolt Carrier Type: 1-Piece w/Integral Piston Strike Face

1-Piece w/Integral Piston Strike Face Weight: 4.23 lbs

This Adams Arms AR-15 A3 Base MOE Mid Length Gas Piston Upper Assembly is chambered in 5.56x45mm NATO and comes ready to fire right out of the box upon installation onto any standard AR-15 lower receiver. This Base Mid 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 black Magpul MOE polymer 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 mid length gas system for a smoother recoil impulse and longer sight radius.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 with it due to the 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.

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.