The San Tan Tactical STT-15 Pillar Upper Receiver is the lightest billet upper available, crafted from aerospace-grade 7075-T651 aluminum. Designed for shooters who demand performance, this upper features a unique truss design that distributes stress evenly, enhancing both strength and accuracy. With M4 feed ramps and a mil-spec Type III hard coat anodized finish, this upper receiver not only excels in functionality but also looks great on any build. Lightweight yet robust, it's the perfect choice for those looking to build a high-performance rifle with a sleek profile. Intended Use: Ideal for competitive shooting and tactical applications. Key Benefits: Enhanced strength and accuracy due to innovative truss design. Key Features: - Constructed from 7075-T651 aerospace-grade aluminum - Unique truss pockets for stress distribution - M4 feed ramps for reliable feeding - Mil-spec Type III Class II hard coat anodized finish Summary: Upgrade your rifle build with the San Tan Tactical STT-15 Pillar Upper Receiver, designed for shooters who prioritize performance, weight savings, and durability. Perfect for competitive shooting or tactical use, this upper receiver will help you achieve greater accuracy and control.