A Spike's Tactical ST-15 AR Pistol is a compact, semi-automatic firearm built on the AR-15 platform, designed for maneuverability while retaining the modularity and performance of a full-size AR. Spike's Tactical is known for producing rifles and pistols with forged or billet aluminum receivers, quality barrels, and durable finishes. Typical ST-15 AR pistols feature a short barrel, free-floating handguard, direct-impingement operating system, and chambering in 5.56 NATO/.223 Remington. Many models use a 1:7 twist barrel designed to stabilize a wide range of bullet weights and include a Picatinny top rail for optics and accessories. This firearm comes exactly as you see in the pictures provided