Barrel: Barrel is made for Palmetto State Armory by FN Manufacturing using their proprietary blend of Hammer forged chrome molly vanadium that is referred to as "Machine Gun Steel" by virtue of its use in FN's M249 and M240 weapons. The hammer forging process work hardens the steel, making it more durable. In addition, the chrome process for the bore allows for a lining almost twice as thick as a standard M16 for enhanced durability. Chambered in 5.56 NATO, with a 1:7 twist, M4 barrel extension with extended feed ramps, and a carbine gas system. The barrel has an M4 profile, is Mil-spec phosphate coated, and MP/HP tested. The upper is finished off with an Adjustable Gas Block, A PRI Gen 3 FDE Tube, and a Pin/Weld Surefire Warcomp. Upper: Forged 7075-T6 A3 AR upper is made to MIL-SPECS. These uppers are T-Marked engraved. Bolt Carrier Group: Father's of Freedom BCG by Microbest with Sprinco Extractor Spring and Carpenter 158 MP Bolt. Lower: Complete Sabre-15 lower with black B5 Bravo stock and grip. Coyote Brown finish. Marked multi-caliber. Comes Standard with Springco Buffer Spring, H2 Buffer, Battle Arms Development Pivot/Takedown Pins, Sabre Claw Two Stage Trigger, and Anti-Walk Pins.