The Stern Defense AR-15 Upper Receiver is a precision-machined, Mil-Spec flat-top component designed for high-performance builds. Crafted from 7075-T6 aluminum, it features a Type III Class 2 black hardcoat anodized finish for superior wear and corrosion resistance. The internal bore is treated with Mil-Spec dry film lube to ensure smooth cycling of the bolt carrier group, and the unit includes M4-style feed ramps for reliable ammunition feeding. This assembled receiver comes complete with a forward assist and a unique laser-engraved Get Stern dust cover, providing a rugged and stylish foundation for any AR-15 rifle or pistol. Note: This is an assembled upper receiver including the forward assist and dust cover, but it requires a barrel, BCG, and handguard to complete.