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Adams Arms Carbine Base Upper 11.5" Pistol/SBR Piston Upper 5.56
Adams Arms Carbine Base Upper 11.5" Pistol/SBR Piston Upper 5.56

MSRP: $777.34
Sale Price: $449.95
JoeBob dun saved you $327.39!

Availability: This item is currently on order
Product Code: ADAMS-UA-11.5-C-BASE-556

Muzzle Device*:

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***This item is an AR15 SBR/Pistol upper. All NFA laws apply! Must be used on NFA registered SBR lower OR pistol lower!***

The 5.56 Carbine Base 11.5" Upper is a short barreled pistol piston upper that incorporates the patented Adams Arms technology. It comes with our proprietary Melonited heavy contour barrel and carbine length gas piston system. Because the piston chamber is the same size as the chamber on the rest of the Adams Arms gas lengths this 11.5" upper now has the proper dwell time to get cyclic rate and bullet velocity needed to make this a viable short barreled option for any CQB scenarios. This creates the shortest, most reliable, and accurate complete upper.


Upper Receiver: A4 Flat-Top, Forged
Barrel Length: 11.5"
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, Carbine Length
Sights: None, Single Rail Gas Block

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