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Summary: The description, specs, photo, pricing and user ratings for STI’s Duty One 4 pistol.

Manufacturer’s Description

STI‘s Duty One 4 single-stack 1911 pistol is built on a forged steel, standard-width frame with a tactical rail and chambered in 9mm, .40 SW or .45 ACP. STI milled the picatinny rail into the dust cover, and it accepts all industry standard light mounts.

Other features include:

• A 4.26” fully supported STI ramped barrel with a match-grade bushing;
• an STI International single-side thumb safety;
• an STI International high-rise beavertail grip safety;
• a flat, checkered mainspring housing;
• an STI TAS (i.e., tactical adjustable sight) low-snag rear sight;
• an STI ramp front sight;
• abbreviated front serrations and grid rear serrations on the slide;
• grid serrations on the front strap;
• a lowered and flared ejection port;
• a STI RecoilMaster guide rod system
• a commander-style hammer
• the patented STI International trigger system.
• G10 mycarta grips; and
• a matte blue finish.

Options include a hard chrome finish and  fixed, two-dot titanium sights.

Note: STI also offers and aluminum-framed version of this pistol, the Duty One Lt 4.0.

The Specs

Caliber	Capacity	BBL	OAL	Height	Weight
9mm, .40 SW, .45 ACP	n/a	4.26″	8″	n/a	36.3 oz.

MSRP: $1,330

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