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Open Grandmaster

Open Grandmaster

Open Grandmaster

For those competitors who demand the ultimate race pistol, STI International delivers with the STI GM. Incorporating unique features with STI’s 2011® technology and Trubor compensated barrel, the STI GM is a race ready factory pistol with custom pistol distinctiveness.

Product Description

Originally only offered from the STI custom shop, the GM is now available as a standard model. Built on the STI Modular Steel 2011® 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 compensated barrel 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. The GM comes complete with a mounted C-More Railway sight with blast shield. An STI team shirt, STI cap, and factory grouping target are also included with the GM.

Note on Ammo: The STI TruBor is designed and tuned for IPSC Major Power Factor grade ammunition. Factory .38 Super and .38 Super +P generally do not meet the minimum power and pressure levels required for proper operation of these competition grade firearms. For IPSC load data, visit Jeff Maass’ IPSC Resources Page.

The GM ships with one 140mm magazine.

Calibers 9×19, .38 Super
Frame STI Modular Steel 2011®
Grips STI 2011® Glass Filled Polymer Modular (Black) with Stainless Steel Magwell and Drilled & Tapped Mag Release
Slide Classic Flat Top with Slide Lightening, with STI Sabertooth Cocking Serrations
Trigger STI Long Curved Trigger
Barrel 5.01” (12.72cm) STI Trubor Bull Barrel, Ramped, Fully Supported w/ 2” Integral Comp. (T1 is 1.6”/4.06cm)
Safeties STI High-Ride Beavertail Grip Safety
Ambidextrous Thumb Safeties
Guide Rod STI Recoil Master
Sights C-More Scope (Gray)
Overall Length 10.5” (26.67cm)
Weight .38Super= 44.6 oz (1265.39g)
Finish Hard Chrome w/ Color Inlay (blue)
Competition Approval
  • IPSC




10 round magazine
instead of standard 126mm
No additional charge


Magazine Capacity
Caliber 126mm 140mm 170mm
9×19, .38 Super 17+1 20+1 26+1
.40 S&W, 10mm N/A N/A N/A
.45 ACP, .357 Sig N/A N/A N/A


Pistol Includes
One STI Team Shirt
One STI Cap
Test Target


9×19 has the T1 w/ 1.6″ integral comp.
.38S has the T2 Comp w/2″ integral comp.