PSA AR-15 UPPER 5.56 16" MID-LENGTH 1/7 NITRIDE 13.5" M-LOK W/NIBX BCG & CH

Barrel Length: 16" Gas System: Mid-Length Barrel Profile: A2 Style Barrel Steel: 4150V Barrel Finish: Nitride Black 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 Receiver Type: M4 Hand Guard Type: PSA 13.5" M-Lok Lightweight Rail Bolt Carrier Group Included: Yes, Nickel Boron Bolt Steel: Carpenter 158 Bolt Carrier Profile: Full-Auto Charging Handle Included: Yes