STI Edge in 45 ACP. Less common than the 40 S&W version, the 45 ACP Edge was used in USPSA Limited-10 and IPSC Standard division. The wider magazine body and 45 ACP-specific barrel geometry are distinct from the 40 S&W and 9mm variants. Type: Pistol Action: Semi-Automatic Caliber: 45 ACP Capacity: 14 Year introduced: 1997, USA Weight: 40.5 oz Overall length: 9" Status: Discontinued Intended use: USPSA Limited-10, IPSC Standard, Competition