Description PSA 16″ Mid-Length SS Upper The PSA 16″ Mid-Length SS upper has stainless steel barrel chambered in 5.56 NATO, with a 1:7 twist, M4 barrel extension, and a mid-length gas system. Barrel: 416R Stainless steel. Chambered in 5.56 NATO, with a 1:7 twist rate, M4 barrel extension, and a mid-length gas system. The barrel is finished off with a .750″ low-profile gas block, 13.5″ PSA lightweight M-Lok free-float rail, and A2 flash hider. Upper: Forged 7075-T6 A3 AR stealth upper is machined to MIL-SPECS and hard coat anodized. These uppers are made for us right here in the USA by a mil-spec manufacturer. No T-marks or logos on the receiver for a more uniform and understated appearance. Bolt Carrier Group: For AR15 and M16 rifles and carbines. Bolt is made of shot-peened, Mil-spec Carpenter 158® steel. Gas key is secured with grade 8 fasteners and staked. DETAILS: Barrel Length: 16″ Gas System: Mid-length Barrel Profile: A2 Style Barrel Steel: 416R Barrel Finish: Stainless Steel Chrome Lining: None Muzzle Thread: 1/2-28 Chamber: 5.56 NATO Twist Rate: 1:7 Barrel Extension: M4 Diameter at Gas Block: .750 Gas Block Type: Low-profile Muzzle Device: A2 Flash Hider Receiver Material: Forged 7075 T6 No T-marks Receiver Type: M4 Handguard Type: PSA 13.5″ Lightweight M-Lok Free Float Rail Bolt Carrier Group Included: Yes Bolt Steel: Carpenter 158 Bolt Carrier Profile: Full-Auto Charging Handle Included: Yes Overall Length: 24.5″
