PSA 16" MID-LENGTH 5.56 NATO 1:7 NITRIDE 13.5" HEX M-LOK UPPER WITH BCG & CH

Barrel Length: 16" Gas System: Mid-length Barrel Profile: A2 Barrel Steel: Chrome-Moly Vanadium Barrel Finish: Nitride 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 Handguard Type: PSA 13.5" Hex Full Picatinny 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"