STI Spartan III in 9mm. Single-stack 1911 in 9mm for USPSA Single Stack minor power factor. The 9mm Spartan III uses a standard single-stack 1911 magazine with 9mm feed geometry. Less common than the 45 ACP Spartan III. Type: Pistol Action: Semi-Automatic Caliber: 9mm Capacity: 9 Year introduced: 2010, USA Weight: 34.5 oz Overall length: 8.5" Status: Discontinued Intended use: USPSA Single Stack, Service