Rock Island Armory's departure from the 1911 format into a modern polymer-frame striker-fired pistol. The STK100 uses an aluminum frame insert and targets the duty-pistol market at a budget price. Type: Pistol Action: Semi-Automatic Caliber: 9mm Capacity: 17 Year introduced: 2022, Philippines Weight: 28.5 oz Overall length: 8.1" Status: Active Intended use: Service / Home Defense