STI GM Originally only offered from the STI custom shop, the GM is now a available as a standard model. Built on the patented modular steel frame with a blue polymer grip, the STI GM utilizes the Trubor compensated barrel which is machined from ONE PIECE of 416, Rifle Grade, Stainless Steel. The Trubor is designed to eliminate misalignment of the barrel and compensator bore or movement of the compensator along the barrel threads, giving the shooter a more consistent performance and reduced muzzle flip. The GM slide has classic scalloped sides, STI saber-tooth rear cocking serrations, flat top and slide lightening along the rear of the slide. Additional enhancements include STI's RecoilMaster guide rod system, STI stainless steel magwell, stainless steel ambidextrous safeties, stainless steel high rise grip safety, drilled and tapped mag release, and hard chrome finish with color inlay in the engraving. GM comes complete with either a mounted C-More Railway or a mounted OKO Reflex sight. An STI team shirt, STI cap, and factory grouping target are also included with the GM. The STI GM is available in 9x19 (9mm Major) & .38 super. Caliber: 9mm "major", 9X23, .38 Super Frame: STI Patented Modular (Steel), STI Patented Modular Polymer (Blue or Red) Grip: Stainless Mag well Slide: Classic Trigger: Long Curved Barrel: STI Gunsmith Blank Safeties: Stainless STI Grip and Ambi sided thumb Guide Rod: STI RecoilMaster Sights: STI Front w/ STI Adjustable Rear Overall Length: 8-5/8” Height: 5.6" Weight: 38.5 oz. Finish: Blue Competition Approvals: IPSC, USPSA