The modern defensive pistol platform demands compactness without sacrificing precision, and this AR-style pistol is built to deliver both. Thoughtful engineering, tight tolerances, and serviceable ergonomics make it a strong option for users who want an accurate short-barrel 5.56 platform for home defense and short-range tactical roles.

SAN-TAN TACTICAL STT-15 — engineered as a precision 5.56x45mm AR-15 Pistol, the STT-15 brings matched, hand-finished pillar billet sets and a fully ambidextrous lower with three QD attachment points for fast, intuitive handling. Shop this product

Design and Materials

The SAN-TAN TACTICAL STT-15 uses a single-piece upper machined from 7075T6 Certified Aerospace Aluminum for superior strength-to-weight and long-term durability. Critical surfaces — the bore, receiver extension face, barrel nut threads and barrel extension — are machined in one operation to ensure concentricity and perpendicular alignment to the barrel assembly. Each receiver set is serial number-matched and hand-ground for a repeatable, tight fit that benefits accuracy and longevity. At a price of $1,721.99, the STT-15 positions itself as a high-end, precision-focused pistol option.

Lower Features and Ergonomics

The fully ambidextrous lower improves accessibility for left- and right-handed shooters and the three QD attachment points allow flexible sling configurations for vehicle carry, duty use, or home-defense setups. Hand-finished billet pillar sets contribute to receiver rigidity and consistent lock-up under repeated use.

Barrel, Accuracy, and 5.56 Performance

The San Tan 5.56x45mm barrel is built from durable 41V50 vanadium steel with a 1:7 twist rate—well suited to stabilize heavier 62–77 grain projectiles typical in defensive and duty loads. The barrel is threaded 1/2-28 for muzzle devices or suppressors, and the dimpled gas block alignment ensures secure gas system retention and consistent cycling. The single-op machining approach directly supports tight concentricity, which translates to more repeatable groups from a pistol-length barrel.

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Operational Considerations

In defensive roles the 5.56x45mm cartridge offers low recoil, quick follow-up shots, and widespread ammunition availability. The STT-15’s threaded muzzle and 1:7 twist make it compatible with common muzzle devices and heavier defensive projectiles, while the ambidextrous controls and QD sling points support rapid maneuvering and retention drills.

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