The Adams Arms Gas Piston Upper is Complete upper receiver assembly comes ready to install on mil-spec lower receiver. The advantages of AR gas piston operation are clean, positive cycling and a less violent operating cycle. As gas isn’t vented into the piston AR receiver, the bolt, bolt carrier and fire control group remain clean for far longer and require much less cleaning. A cooler running gun is less hard on its components and less lube means less dirt and sand grinding away at the AR’s internals.
The less violent cycling of the gas piston AR gets your sights back on target faster and all but eliminates the chance of hot gas venting into your face. Nor will the charging handle blow back in the event of latch failure. The AR-15 piston upper is forged from 6061 T-6 aluminum Type III hard anodized for corrosion and abrasion protection.
The Adams Arms AR-15 piston upper gas block offers three settings to enable normal fire, fire with a suppressor fitted and single shot, non-cycling operation. All versions of the gas piston AR upper have a flat top with Picatinny rail and a quad rail hand guard. The barrels are USGI chrome-lined with the M16A2 flash hider.
Carbine – 16″ barrel and M4-style carbine handguard.
Pistol – 7½” barrel and two-piece, machined aluminum handguard with four, 3″ Picatinny rails. Barrel is black Melonite coated for better wear and scuff resistance and up to 60% more corrosion resistance than traditional phosphate-coating.
Pistol Extended Rail – 7½” Melonite-coated barrel, and an extended, aluminum handguard with 6″ side rails, a 5¾” bottom rail, and a 4¼” top rail that forms a continuous 12″ rail with the receiver flattop and gas block. Side rails include integral sockets for QD sling swivels.
The pistol upper is subject to NFA rules – do not fit to a lower with a buttstock fitted without getting authorisation from the BATF for a Short Barrelled Rifle.
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You may find this video of the Brownells action block interesting.
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