Ultimate in my opinion STI Tactical 3.0 in 9mm STI precision in a small frame. Calibers 9×19, .40S&W, .45ACP Frame STI Modular Aluminum 2011® with Integral Tactical Rail Grips STI 2011® Glass Filled Polymer Modular (Black) Slide Unique 4140 Carbon Steel Slide Slide Features Unique with Front & Rear Cocking Serrations, Flat Top Trigger STI Long Curve Barrel 3.75” (9.52cm) STI Bull Barrel, Ramped, Fully Supported Hammer STI Square style Safeties STI High Rise Beavertail Grip Safety Ambidextrous Thumb Safeties Guide Rod STI Recoil Master Sights STI Ramped Front STI Ledge style Rear Overall Length 6.75” (17.14cm) Weight 30.1 oz (853.32g) Finish Slide Blued, Frame Cerakoted (Black) Competition Approval Pending