San Tan Tactical's STT15 5.56x45mm AR-15 Pistol is a precision-engineered firearm that combines unmatched craftsmanship with advanced materials for outstanding performance. Featuring true matched, hand-finished pillar billet sets, the STT15 lower is fully ambidextrous and includes three QD attachment points for versatile and secure mounting. The upper is precision-machined from a single block of 7075T6 Certified Aerospace Aluminum, ensuring exceptional strength and durability. Every critical surface, including the bore, receiver extension face, barrel nut threads and barrel extension, is machined in a single operation to guarantee perfect concentricity and alignment with the barrel assembly. The receiver sets are serial-number matched and hand-ground for the optimal fit, finish and long-term accuracy. Completing the design is the San Tan 5.56x45mm barrel, crafted from 41V50 vanadium steel with a 1:7 twist rate. This barrel is threaded 1/2-28 and dimpled for precise gas block alignment and secure retention, ensuring reliable performance with every shot. With meticulous attention to detail, the STT15 AR-15 Pistol delivers exceptional quality and precision for the discerning shooter. STT suppressor optimized enhanced bolt carrier group improves suppressor efficiency and longevity STT 5.56x45mm barrel for superior performance and accuracy Equipped with a CMC Triggers Flat 3.5lb single-stage drop-in trigger for crisp, consistent performance Magpul MOE grip and stock deliver ergonomic handling and stability for improved shooting performance M-LOK handguard ensures a secure and customizable attachment system for tactical enhancements Equipped with an ambidextrous charging handle for seamless operation from either side Mil-Spec 6-position buffer tube with H1 buffer provides recoil control and adjustability Precision CNC machined from Billet 7075-T6 certified aluminum for superior strength and durability Features extended feed ramps for reliable and consistent feeding Includes ambidextrous magazine and bolt release controls for improved functionality and ease of use A Type III, Class 2 hardcoat anodized olive drab green finish offers a rugged and tactical appearance