This Noveske N4 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. Additional features include a pinned low profile gas block, a Noveske Pig Pen suppressor compatible muzzle device, and a shot-peened, MP-tested bolt housed within a Mil-Spec bolt carrier.