The Spikes Tactical Flat Top Stripped Upper Receiver for the M4 platform is crafted from high-quality 7075 T6 aluminum ensuring both strength and durability. With its Type III Hardcoat Anodized finish this upper receiver is built to withstand rigorous use. It comes with a forward assist and ejection port door spring and rod already installed maintaining a sleek and functional design. Weighing only 8.5 ounces it offers a lightweight yet robust component for your build. Please note additional parts such as the charging handle barrel handguard gas block muzzle device gas tube and bolt carrier group are required to complete assembly. This receiver is multi-caliber and optic ready offering versatility and ease of customization for firearm enthusiasts.