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The San Tan Tactical STT-15 is a stripped billet lower receiver designed as a true ambidextrous platform. If you're building your first AR or your fifth, this lower is engineered to work for right-handed shooters, left-handed shooters, or anyone who needs to shoot off-hand in a pinch.
Machined from a solid block of 7075-T651 aerospace-grade aluminum, this receiver holds ultra-tight tolerances throughout. The manufacturing process uses CNC machinery that cuts the lower directly from billet, not cast, which gives it superior strength and a refined surface finish. Everything from the magazine well to the control surfaces gets that precision treatment, resulting in a cleaner, more durable platform than cheaper alternatives.
The STT-15 features ambidextrous bolt release and magazine release buttons machined directly into both sides of the lower receiver. These controls are sized and positioned for actual usability rather than appearing simply for appearance. The enlarged magazine well flares in all the right places to speed up reloads, and quick-detach sling attachment points sit on both sides for flexibility in how you rig your rifle. It's one-piece ambidextrous design, not a lower with added bolt-on parts.
You'll need a lower parts kit, buffer tube, stock, and bolt carrier group to finish your build. The receiver ships with the ambidextrous controls already installed, so you're starting ahead compared to a standard stripped lower. The STT-15 accepts all standard Mil-Spec AR-15 components and plays well with quality upper receivers from any manufacturer.
Yes. The STT-15 accepts all standard Mil-Spec AR-15 components and lower parts kits. You'll need a lower parts kit, buffer tube, stock, and upper receiver to complete your build.
The STT-15 machines both the bolt and magazine release buttons directly into the receiver on both sides, rather than adding parts onto a standard lower. This integrated design keeps everything symmetrical and functional without unnecessary weight. The enlarged magazine well and quick-detach sling points follow the same ambidextrous approach.
Absolutely. The STT-15 was designed from the ground up with left-handed operation in mind. Both the bolt release and magazine release work equally well from either side, and the overall ergonomics support comfortable operation for left-hand dominant shooters.
No. This is a stripped lower receiver, meaning it comes with just the receiver and the ambidextrous controls already installed. You'll need to source a lower parts kit separately to complete the build.
The STT-15 includes integrated ambidextrous controls machined directly into the receiver, which would otherwise require buying and installing separate aftermarket parts. The precision machining, aerospace-grade aluminum, and American manufacturing also contribute to the quality and price point.
| UPC | 680599034077 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | STT-15 |
| Action | |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Color | Black |
| Model | |
| Product Type | Stripped Lower Receiver |
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