16" Carbine Base Upper

Product Code: FGAA-01053a

Availability: Backordered 6-8 weeks

16" Carbine Base Upper


The 5.56 Carbine Base 16" Upper is a standard M4 style upper that incorporates the patented Adams Arms technology. The piston system parts and the barrel have been treated with our salt nitride Meloniting process making them harder and more corrosive resistant than hard chrome. With the patented Adams Arms piston system, you'll have an upper that will run cleaner, cooler, and longer than any other AR upper you own.



Upper Receiver: A4 Flat-Top, Forged

Barrel Length: 16"

Barrel Contour: Government

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, Mid-Length

Sights: None, Single Rail Gas Block

Weight: 4.192 lbs


Customer Reviews 2 item(s)

No sugar coating here!
After reading some of the reviews, I was reluctant to buy this upper. I was concerned about the "fit" problem that some folks experienced. This was NOT the case with my upper. This upper fits very snugly on all my AR15 lowers. At first I had many "failure to feed" problems. But, after about 80 rounds, the problem went away. Now, it functions flawlessly and is very accurate. I have not had any problems since the "failure to feed" issue. In my opinion this is an excellent addition to any AR15. Review by Trapper John / (Posted on 1/10/2015)
Most bad ass upper I've ever had
The base upper was a game changer for me. It shoots smoother & is more reliable than all my uppers. What I really love is the ease at which you can change the gas settings so i can run my cans more quietly & with less blowback. It was so good that I bought a second. The only changes that I made to it where the handgaurd & a suppresser muzzle brake. Review by Jorge / (Posted on 9/17/2014)
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