Product Description The San Tan Tactical Pillar Lite Upper Receiver is a precision-engineered, mil-spec upper receiver designed for AR-15, M16, and M4 weapons platforms. Machined from a single billet of 7075-T651 aerospace-grade aluminum, this upper receiver features San Tan Tactical&';s signature PILLAR truss pockets, which provide increased structural rigidity while keeping weight to a minimum. The flat-top Picatinny rail is machined with T-markings for easy and repeatable optic relocation, and M4 feed ramps are incorporated to promote reliable feeding. With a Mil Spec Type III Class II hard coat anodized black finish, this upper is built to withstand the rigors of hard use. It interfaces with all known AR-15/M16/M4 weapons systems and accessories, accepts all known handguards without modifications, and is compatible with all known battery assist levers on the market. Backed by STT&';s unmatched lifetime warranty and proudly made in the USA, the Pillar Lite is the ideal foundation for a high-performance build. Note: does not include port door assembly. Product Highlights Single Billet Construction: Machined from a single billet of 7075-T651 aerospace-grade aluminum for superior strength and durability. PILLAR Truss Pocket Design: Exclusive truss pockets increase structural rigidity without adding unnecessary weight. Universal Compatibility: Interfaces with all AR-15/M16/M4 weapons systems, accessories, and handguards without modifications. Mil-Spec Type III Class II Hard Coat Anodized Finish: Provides lasting corrosion resistance and a durable, matte black appearance. Lifetime Warranty and USA Made: Backed by San Tan Tactical&';s unmatched lifetime warranty and manufactured in the United States. Specs Brand: San Tan Tactical MPN: STT-15-LT-PILLAR-UPPER UPC: 680599034022 Type: Upper Receiver Compatible Calibers: .223 Remington / 5.56 NATO Material: 7075-T651 Aerospace Grade Aluminum Finish: Mil Spec Type III Class II Hard Coat Anodized Black Sights: Flat Top / Optic Ready Color: Black Feed Ramps: M4 Port Door Assembly Included: No Country of Manufacture: USA Series: STT-15 Lite Pillar Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer. ]]>