ADVANCED ARMAMENT .223/5.56 UPPER ASSEMBLY: 16" NITRIDED (SBN), KAC URX RAIL (102780)
Advanced Armament (AAC) 5.56 NATO Upper Assembly: 16" nitrided barrel with KAC URX Rail and AAC 51T BLACKOUT™ Flash Hider (102780)
List Price: $1,080.00
LEFT IN STOCK: 0
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Stock Status:(Out of Stock)
This Advanced Armament Corp. (AAC) AR-15 Upper Receiver Assembly in 5.56 NATO Blackout is a pin-on, ready-to-shoot top end for use with any standard AR-15 lower receiver. The Mil-Spec 4150 chrome moly vanadium steel barrel comes equipped with 1 in 7" twist rifling, M4 feed ramps, a low profile steel gas block, and is finished inside and out with a protective black nitride treatment for superior durability and corrosion resistance. The muzzle is threaded with a 5/8"-24 pitch for easy installation of a silencer, and is topped off with an effective AAC 51T Blackout flash hider.
The upper features a forged M4-Style flat-top receiver onto which a Knight's Armament free floating URX 3.1 Quad Rail System is rigidly attached. The heat-treated, full auto bolt carrier is finished in a slick Nickel Boron coating, and comes equipped with a properly-staked gas key and Carpenter 158 steel bolt assembly.
This 16" 5.56 NATO AAC upper utilizes the versatile carbine length gas system, a good choice for this cartridge if various weights and types of ammunition are to be used. Most subsonic and supersonic loads, fired from either a suppressed or unsuppressed gun, are compatible with this configuration. However, some subsonic ammunition may not always cycle reliably under adverse conditions or in a severely fouled firearm without a sound suppressor attached to provide extra backpressure.
16" Barrel: 4150 Chromium-Moly Vanadium (CMV), Salt Bath Nitrided (SBN)
1:7: Twist, threaded 5/8-24
AAC 51T BLACKOUT™ Flash Hider
"Full Auto" Bolt Carrier Group
Knights Armament Corp. URX Rail
Ready to drop onto your AR15/M16/M4 lower! Works with an AR lower with "Mil-Spec" push pin locations
What is a Salt Bath Nitride-Treated Barrel?
More commonly referred to as nitriding, it's a rifle or upper subjected to a salt bath ferritic nitrocarburizing surface conversion process. The AAC barrel upper is made from 4150 CMV and specially processed to have up to 60% more life than a chrome-lined barrel and without the potential loss in accuracy from uneven coating. This processing also results in extreme corrosion resistance. Unlike chrome lining, where the chrome is built up on the surface, nitriding converts the surface without the risk of dimensional build up.
Caliber: 5.56 NATO (accepts .223 Remington)
Upper Receiver: A3 Flat-Top
Barrel Length: 16"
Barrel Contour: Medium
Barrel Material: 4150 Chrome Moly Vanadium Steel
Muzzle Thread Pattern: 5/8"-24
Chrome Lined: No
Barrel Finish: Black Nitride / Melonite
Twist Rate: 1 in 7"
M4 Feed Ramps: Yes
Muzzle Device: AAC 51-T Blackout Flash Hider
Gas System Length: Carbine
Gas Block Diameter: 0.750"
Handguard: Knight's Armament URX 3.1 Quad Rail, Free Float
Bolt Carrier Assembly Included: Yes
Bolt Carrier Type: Mil-Spec, Nickel Boron Finish
Part No.: 102780
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