Complete upper receiver assembly comes ready to install on mil-spec lower receiver to produce a reliable, positive-cycling gas piston gun. Adams Arms’ proven piston system doesn’t vent hot gases and burned powder into the bolt carrier and receiver, so the gun runs cooler, with less fouling and wear on the action, and easier maintenance. Short-stroke piston shaft eliminates concussive gas expansion in the upper receiver for less violent cycling, smoother feeding, and reduced felt recoil. The receiver is forged from 6061 T6 aluminum and features M4 feed ramp cuts and a 13-slot Picatinny-cut flattop rail. The adjustable gas block allows three levels of gas release: normal fire, firing with a suppressor attached, or a single round fired without cycling. Picatinny rail on top of gas block accepts a variety of clamp-on tactical sights. All models have chrome-lined barrels chambered for 5.56mm NATO, with an A2 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. Midlength - 16" barrel, M4-style handguards, and midlength gas system. All NFA rules apply.
SPECS:
Receiver/Pistol Handguards – 6061 T6 aluminum, hardcoat anodized, black. Barrel – Chrome-moly steel. Gas Block, Piston Tube, Bolt Carrier – Steel, black oxide finish. Piston – Stainless steel. Carbine – 16" (40.6cm) barrel, Parkerized, matte black. 1-7" right handed twist rifling. Reinforced polymer composite handguard, black. 4.2 lb. (1.9kg) total weight. Pistol – 7.5" (19cm) barrel, Melonite coated, matte black. 1-7" right handed twist rifling. 3.6 lb. (1.68kg) total weight. Pistol Extended Rail – 7.5" barrel, Melonite coated, matte black. 1-7" right handed twist rifling. 3.8 lb. (1.7kg) total weight.
Catalog page 492