STI Duty One in its pneumatic version strongly resembles the iconic Colt 1911 pistol, also known as the Colt Government, in its appearance.
Meeting STI’s rigorous quality standards, the Duty One comes equipped with a matte-finished metal receiver. Distinctive serrations have been added to the grip area of the receiver—both at the front, near the front sight, and at the rear above the grip—making reloading easier and ensuring a secure grip even when wearing gloves!
Trigger and hammer are both crafted from metal. Featuring a SA/DA (single action/double action) trigger mechanism, the firearm allows shots to be fired either by manually cocking the hammer (via thumb or slide action) or through "self-cocking," where a full trigger pull both cocks and releases the hammer for firing.
Chambered for 4.5 mm steel BBs (commonly known as BB), the pistol is fed from a magazine with a capacity of up to 20 rounds. Compressed CO2 powers the BBs, with both the magazine and 12g CO2 cartridge housed in the grip. The gas cartridge allows for around 100 shots per fill, with an initial projectile velocity of 114–124 m/s!
Operation is secured by an adjustable safety positioned above the right thumb. The safety immobilizes the trigger (which stays in the rest position), the hammer (in any position), and the receiver. A wing-style safety button is placed on the pistol’s left side. When engaged, a white dot and the letter “S” become visible; in the off position, a red dot and the letter "F" appear.
Pulling the slide back to cock the hammer holds the moving receiver in the rear position when the magazine is empty—the slide release lever is found on the left side of the frame above the trigger.
Magazine release is achieved by pressing a button at the base of the trigger guard (on the left side of the grip). The nylon grip scale in this section is ergonomically designed to allow comfortable use for individuals with smaller hands.
The grip scales are finished in a graphite-black hue and molded with diagonal stripes, displaying a prominent STI (an American manufacturer) logo in the center. Uncovered sections at the front and rear of the grip feature texturing—this rough surface, paired with the scale design, maximizes control over the firearm.
Target acquisition is quick thanks to open sights, featuring horizontally adjustable front and rear sights. Below the barrel lies a STANAG 2324 standard rail (also referred to as a weaver or picatinny rail), allowing attachment of a laser or tactical flashlight.
Genuine STI branding is present on both grip scales and the receiver, complemented by a unique serial number engraved on the frame.
Heavyweight, robust, and realistic in appearance, the replica closely mimics the operational features of its modern, combat-ready counterpart.
Technical data
Model: Duty One
Caliber: 4.5 mm (.177)
BB Type: 4.46 mm (BB)
BB: round steel, so-called BB
Propulsion: 12g CO2 cartridge
Initial velocity: 114-124 m/s
Bullet kinetic energy: Overall length: 220 mm
Barrel length: 120 mm
Mass: 825 g
Magazine: 20 pcs
Manufacturer: STI, USA / Action Sport Games, Denmark
