2WheeledSpeed

The Sig Sauer Mosquito is a semi-automatic double action pistol chambered in .22 Long Rifle. It comes with a 10 round magazine, and this particular model has a threaded barrel to accept a silencer. The frame is polymer and includes an accessory rail.

Overall this gun is only slightly smaller (10% smaller) than a Sig P226, and because the controls and trigger are similar to the P226 (And many other Sig pistols) it makes an excellent trainer pistol before starting on a larger Sig. This gun feels good in my hands, it is a Sig afterall. The ergonomics are pretty darned good.

The slide and mag releases, and decocker are all what you'd expect of a Sig. They work well and are conveniently placed. Probably because this is a meant to be a training pistol a slide mounted ambidextrous safety switch is included, but it's not necessary since this is a double action pistol designed to be carried with the hammer down. The safety is in an awkward location anyways, it wouldn't be as easy to switch off under pressure as something like a 1911 safety switch.

The 3 dot sights are easy to use and accuracy is decent, but not perfect. If you want to empty a whole magazine into a single hole on the target, this isn't the gun for you. I see this gun more as a trainer meant for getting people used to shooting without scaring the crap out of them with the recoil from larger calibers, and as a practice gun allowing Sig owners to train cheaply.

The trigger is where I believe this otherwise good gun starts to go downhill. In double action mode the trigger is a lot heavier than I'd like. In single action mode I think there is too much "take up" or slack in the trigger, and the pull is still a little too heavy and mushy for my tastes. Sorry if that explanation isn't perfect, but I really don't like this Sigs trigger.

Reliability is also not one of this guns strong points, for a Sig I'm honestly a little disappointed. It only likes hi-velocity .22LR ammunition, and even then failures aren't uncommon.

In one sense, those failures allow you to train a newbie to recognize and clear jams. But at the same time, it makes this gun a bad personal defense weapon (even if it wasn't a .22LR), and it can be downright aggravating.

I've heard plenty of different things in gunshops and on the internet, some people claim to have zero reliability issues with this gun, some tell stories about having problems very similar to mine. I haven't dug very deep to see if possibly Mosquitos had problems early on and this is one of them, so please keep in mind that your experience with the Mosquito may be different than mine.

Bottom line, I do consider this to be a great training/practice pistol.

I do not believe that .22LR is an adequate defensive caliber, however if you do, I still don't recommend the Mosquito because I have found it to be less than reliable even with quality ammunition.