Engineered for precision and reliability this AR15 upper receiver is crafted from durable 7075T6 aluminum ensuring a robust foundation for your build. Its sleek black finish offers a tactical aesthetic while the pre-installed forward assist and ejection port cover assembly add essential functionality. Designed for the 5.56 NATO caliber this semi-complete upper receiver is optic-ready providing versatility for customization. The interior features a dry film lube for smooth operation. Please note additional components such as a charging handle barrel handguard gas block muzzle device gas tube and bolt carrier group are required to complete this assembly.