M4 Upper Receiver. Barrel: 16" Chrome-lined, chrome moly vanadium. Chambered in 5.56 NATO, with a 1:7 twist, M4 barrel extension, and a carbine-length gas system. The M4 profile barrel is high pressure tested and magnetic particle inspected and then phosphate coated. Barrel is finished off with an .750" diameter F-marked front sight base with sling swivel, standard handguards and an A2 flash hider. Barrel is made for us right here in SC by FN Manufacturing. Rollmarked "5.56 NATO 1/7 CL MP PALMETTO"
Upper: Forged 7075-T6 A3 AR upper is hard coat anodized black for durability. Featuring M4 feedramp cuts, T-marks, these upper upper receivers are made for us right here in the USA. Each upper is assembled to order with US-made parts, and test fired to check gas function. Does not include bolt carrier group or charging handle. 1:7 Twist.