STI VIP in 45 ACP. Lightweight aluminum-frame single-stack carry 1911 in 45 ACP. The aluminum frame reduces the weight of the 45 ACP VIP to approximately 26 oz, making it one of the lightest all-metal 45 ACP carry pistols available. Uses a 3.9-inch barrel with STI bull-barrel configuration. Type: Pistol Action: Semi-Automatic Caliber: 45 ACP Capacity: 7 Year introduced: 2009, USA Weight: 26.5 oz Overall length: 7.3" Status: Discontinued Intended use: CCW, Duty Backup