San Tan Tactical's STT15 5.56x45mm AR-15 Pistol is a masterfully crafted firearm, built with true matched, hand-finished pillar billet sets for superior strength and precision. The STT15 lower is fully ambidextrous, featuring three QD attachment points for added versatility and ease of use. The upper is machined from a single block of 7075T6 Certified Aerospace Aluminum, ensuring exceptional durability and performance. Every critical component, including the bore, receiver extension face, barrel nut threads and barrel extension surfaces, is precision-machined in one seamless operation, guaranteeing perfect concentricity and perpendicularity for the highest level of accuracy. Our receiver sets are serial number-matched and hand-ground, offering an ideal fit and finish that ensures repeatable, long-term precision. The San Tan 5.56x45mm barrel, constructed from 41V50 vanadium steel with a 1:7 twist, is threaded 1/2-28 and features dimpled gas block alignment for secure retention and enhanced reliability. This combination of craftsmanship and top-tier materials makes the STT15 AR-15 Pistol a standout choice for those seeking exceptional performance and accuracy. 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 Desert multicam CeraKote finish enhances durability while providing a rugged, tactical look