This Noveske N4 Infidel Complete AR-15 Upper Assembly comes fully assembled and ready to drop onto any standard AR-15 lower receiver. The N4 upper is a precision machined billet receiver from 7075-T6 with extended feed ramps. The upper is finished with Hardcoat type III anodizing, with Cerakote ceramic black coating for the ultimate finish and performance. It comes equipped with one of Noveske's legendary Cold Hammer Forged Steel barrels, the bore is given improved polygonal rifling that slightly boosts projectile velocity and reduces the speed of the bore's erosion, meaning superior accuracy retention that outlasts that of barrels with conventional rifling. Additional features include a pinned low profile gas block, a pinned KX3 flash hider, and a shot-peened, MP-tested bolt housed within a Mil-Spec bolt carrier. This upper includes a Noveske NSR handguard with the M-Lok rail system and, with an outside diameter of only 1.48" (without accessories attached), it is one of the slimmes...