Santan Stt-15 Pillar 9mm OD Green Rifle

The San Tan Tactical STT-15 Pillar Lower Receiver in Olive Drab anodized finish is a precision-machined stripped lower receiver platform designed for multi-caliber AR-15 builds. This forged aluminum component serves as the foundational fire control group housing and structural anchor point for any AR-15 configuration, whether you're building a 5.56 NATO rifle, 9mm submachine gun platform, or any intermediate caliber system. The anodized olive drab coating provides corrosion resistance and a mil-spec appearance suitable for duty, training, or field operations.

As a stripped lower receiver, this component arrives without a fire control group, buffer tube, or stock assembly—allowing builders complete control over trigger type, safety configuration, and stock system. The pillar design enhances structural rigidity compared to standard lowers, improving accuracy potential and reducing flex during sustained fire or precision shooting. Weighing 0.88 pounds, the STT-15 maintains the lightweight characteristics essential for carbine and rifle platforms while delivering the durability required in duty and training environments. San Tan Tactical's manufacturing tolerances ensure reliable function with standard upper receiver assemblies and mil-spec components.

This lower receiver is purpose-built for law enforcement armorsmiths, military personnel, and civilian AR platform builders seeking a quality foundation for custom rifle builds. Whether constructing a duty carbine, training platform, or specialized caliber conversion, the STT-15 stripped lower provides a regulated, FFL-required component that serves as the legal "firearm" portion of any AR-15 system. The olive drab anodized finish blends with modern tactical gear and holds up under field conditions including exposure to dust, moisture, and temperature extremes.

Stripped lowers require FFL transfer and remain among the most versatile components in the modular AR ecosystem. The STT-15's multi-caliber design means a single lower can be reconfigured with different upper assemblies to fire 5.56 NATO, .308 Winchester, 9mm, .300 Blackout, or other AR-compatible cartridges without modification. This flexibility makes stripped lowers cost-effective for builders planning multiple platform configurations.