The SIG Mosquito is a blowback-operated, semi-automatic pistol based on the SIG Sauer P226 but 10% smaller and chambered for the .22 Long Rifle cartridge. The Mosquito is set up with the same decocker and slide-lock as the larger SIG-Sauer pistols, but also features a slide-mounted ambidextrous manual safety. All models have a Picatinny rail on the dust cover of the frame.
With the exception of the slide-mounted ambidextrous manual safety, the SIG Sauer Mosquito handles just like a regular SIG Sauer service pistol. The frame-mounted decocker is placed forward of the slide stop in the same arrangement as a typical SIG Sauer P-series pistol.
Along with extra mags and holsters, factory accessories include a polymer bridgemount that makes it possible to mount a red-dot sight or other scope accessory. Its Picatinny rail makes it possible to mount lights and/or lasers that are available today.
The standard Mosquito model is chambered in .22 LR and has a double-action/single-action (DA/SA) trigger. The polymer frame and small size (compared to the SIG P226) allow the pistol with magazine to weigh little more than 24.6 oz. The overall height is 5.3 inches with a barrel length of 3.9 inches. The Mosquito’s frame has a Picatinny rail, a ten-round capacity magazine, and adjustable sights.