STI Spartan in 45 ACP. Double-stack 2011-format pistol for USPSA Limited-10 and IPSC Standard division in 45 ACP. The Spartan 45 ACP is less common than the 40 S&W version due to the more limited competitive application of the 45 ACP in double-stack competition formats. Type: Pistol Action: Semi-Automatic Caliber: 45 ACP Capacity: 14 Year introduced: 2003, USA Weight: 38 oz Overall length: 8.5" Status: Discontinued Intended use: USPSA Limited-10, IPSC Standard, Competition