Sig Sauer Mosquito .22 LR DA/SA Blowback Pistol, 4 in Barrel, Made in Germany, Black, 10+1
The Sig Sauer Mosquito is a German-made .22 LR semi-auto with a 4 in barrel, DA/SA operation, and a fixed-barrel blowback system. It features an ambidextrous manual safety with decocker, an integral accessory rail, and adjustable sights with interchangeable-height front blades. This discontinued model remains notable for its combination of SIG ergonomics, safety suite, and user-friendly controls, and its design lineage later continued as the GSG FireFly.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Condition: Good - Clean, well-maintained, minor wear marks.
Bore Rifling: Good Rifling - Intact, well-defined lands and grooves.
Specific Condition Notes: This firearm is in solid functional shape. It shows scratches and blemishes on exterior surfaces.
What's Included
- Sig Sauer Mosquito .22 LR pistol
- 1x 10-round steel single-stack magazine with witness slot and flush baseplate
The Mosquito uses a straight blowback, hammer-fired DA/SA action with a fixed barrel, delivering the simple operation and consistency many shooters expect in a rimfire pistol. The external spurred hammer and DA/SA trigger give clear tactile control over first-shot and follow-up presses.
Safety features are extensive for a rimfire: ambidextrous manual safeties, a decocker, a magazine disconnect, and an internal key lock. These controls are laid out for intuitive operation and mirror SIG’s familiar control scheme.
Sighting is practical and adjustable, with a drift-adjustable rear notch and a polymer front blade with a yellow dot. The design uses interchangeable-height front blades to fine-tune elevation. Rear slide serrations aid manipulation.
The pistol pairs a black polymer frame with an aluminum-zinc alloy slide, keeping weight manageable while maintaining durability for .22 LR. The dust cover integrates an accessory rail for mounting compatible lights or other accessories. Wrap-around textured black polymer grips with SIG SAUER logos provide a secure hold.
This example is marked “MADE IN GERMANY,” reflecting its origin. It is the standard non-threaded 4 in configuration and feeds from a 10-round magazine, for a total capacity of 10+1.