The San Tan Tactical STT-15 billet lower receiver (San Tan Tactical part no. STT-15) is the foundation for an AR-15 build in 5.56/.223. San Tan Tactical designed it as a true ambidextrous AR-15 platform, so right- and left-handed shooters can run the same manual of arms. It is machined from a solid billet of 7075 aluminum rather than forged, which allows very tight tolerances. Builders pair it with a standard AR-15 upper and parts to put together a defensive carbine, range rifle or hunting setup.

Key Specifications

• The receiver is machined from billet 7075 aluminum, an aerospace-grade alloy chosen for strength at low weight.
• The finish is Mil-Spec MIL-A-8625 Type III hard anodizing for wear and corrosion resistance.
• It is built for 5.56/.223 AR-15-pattern uppers, so standard components fit.
• The ambidextrous design lets right- and left-handed shooters use the standard manual of arms.
• The semi-auto action of the AR-15 platform is retained when you build it out.
• It is machined on CNC equipment to ultra-tight tolerances for consistent fit with AR-15 parts.
• The receiver weighs 1 pound 3.4 ounces, light enough for a carbine build.
• It is made in the USA by San Tan Tactical.
• A lifetime warranty from San Tan Tactical backs the receiver.

Frequently Asked Questions

What does this lower receiver fit? It is an AR-15-pattern lower for 5.56/.223 builds and is designed to accept standard AR-15 components.

Is it forged or billet? It is machined from a solid billet of 7075 aluminum, not forged, and finished with Type III hard anodizing.

Is it designed for left-handed shooters? San Tan Tactical designed the STT-15 as a true ambidextrous AR-15 platform, so it works for right- and left-handed shooters alike.

Buy the San Tan Tactical STT-15 Billet Lower Receiver

Order this billet lower from our Lubbock, Texas gun shop for fast, insured shipping to your FFL. Browse more AR-15 lower receivers to match your build.