AR-15 upper receiver with Completion Kit, a high-quality, mil-spec set of components designed for seamless assembly and long-lasting reliability. Whether you're building from the ground up or upgrading an existing rifle, this kit provides everything you need for a precise and dependable fit. Fully assembled forward assist button with claw Forward assist helical spring and roll pin included Ejection port cover, rod, C-clip and spring included Phosphate finish provides enhanced corrosion-resistance