The San Tan Tactical STT‑15 Upper Receiver is a precision‑engineered platform designed for shooters who demand reliability, durability, and top‑tier performance. Constructed from high‑strength 7075‑T6 aluminum and finished in a sleek, matte black coating, this upper delivers a perfect blend of lightweight handling and rugged endurance for both .223 Remington and 5.56 NATO calibers.
Key Features & Benefits
- Versatile Caliber Compatibility: Fully rated for both .223 Rem and 5.56 NATO ammunition, allowing seamless transition between target shooting, tactical training, and field use.
- Premium 7075‑T6 Aluminum Construction: Offers superior strength-to-weight ratio, ensuring the upper remains lightweight without sacrificing structural integrity.
- Durable Black Finish: The corrosion‑resistant matte black coating reduces glare, resists wear, and maintains a tactical aesthetic in any environment.
- Enhanced Gas System: Precision‑machined gas port and adjustable gas block provide reliable cycling and reduced recoil for rapid follow‑up shots.
- Free‑Float Barrel Interface: The STT‑15 is engineered for free‑float barrel installations, improving accuracy by eliminating hand‑induced barrel stress.
- Optimized for STT‑PILLAR‑1 Lower: Seamlessly pairs with the FT STT‑PILLAR‑1 lower to create a complete, high‑performance rifle platform.
- Ready for Customization: Includes multiple mounting points for accessories such as optics, fore‑grips, and rail systems.
Technical Specifications
| Model | STT‑15 |
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| Manufacturer | San Tan Tactical |
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| Compatible Calibers | .223 Remington / 5.56 NATO |
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| Material | 7075‑T6 Aluminum (Anodized Black Finish) |
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| Length | 15.0 inches (overall) |
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| Weight | Approx. 2.1 lbs (without barrel) |
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| UPC | 680599034060 |
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| Part Number | FT STT‑PILLAR‑1 |
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| Barrel Compatibility | Free‑float barrels up to 20 inches |
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| Rail System | M‑LOK slots on top and sides, Picatinny rail on the top |
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| Gas System | Adjustable gas block with precision‑machined gas port |
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Why Choose the San Tan Tactical STT‑15 Upper?
Whether you are building a competition rifle, a tactical platform, or a reliable hunting setup, the STT‑15 delivers the accuracy and consistency required by serious shooters. Its modular design ensures easy integration with existing components, while the high‑grade materials guarantee long‑term performance in harsh conditions.
Pair the STT‑15 with a quality barrel, a reliable lower (such as the FT STT‑PILLAR‑1), and your preferred accessories to create a customized system that meets your exact needs. This upper is also a favorite among law‑enforcement and military training programs for its proven track record and ease of maintenance.
Installation & Compatibility
The STT‑15 upper is engineered for a quick, tool‑free fit with the FT STT‑PILLAR‑1 lower. All necessary mounting points and alignment pins are precision‑drilled to factory tolerances, ensuring a secure fit without the need for extensive fitting. For optimal performance, we recommend:
- Using a matched free‑float barrel for enhanced accuracy.
- Installing the adjustable gas block according to your ammunition load.
- Utilizing M‑LOK accessories for a streamlined, low‑profile setup.
Customer Support & Warranty
San Tan Tactical stands behind every upper receiver with a limited lifetime warranty against manufacturing defects. Our dedicated support team is available to answer installation questions, provide technical guidance, and ensure you get the most out of your STT‑15 platform.
