SKU 51655160235 Brand Palmetto State Armory Model Number 51655160235 UPC 51655160235 DETAILS Barrel Length: 16" Gas System: Mid-Length Barrel Steel: Cold Hammer Forged Chrome Moly Vanadium Barrel Finish: Phosphate Chrome Lined: Yes Muzzle Thread: 1/2-28 Chamber: 5.56 NATO Twist Rate: 1:7 Barrel Extension: M4 Diameter at Gas Block: .750 Muzzle Device: Sabre Compensator Receiver Material: Forged 7075 T6 Receiver Type: M4 T-Marked Hand Guard Type: 15" Knurled Slant Rail Bolt Carrier Group: PSA Custom Fathers of Freedom BCG by MicroBest with Sprinco Extractor Spring