It was with great joy that my wife presented me with a brand new Sig Arms Mosquito a few years ago. She bought it for me as a birthday gift, based solely on the reputation of Sig Arms, and on a well placed "hint" that I was looking for a .22 auto loading pistol. At the time (2005ish) the Mosquito was brand new on the market and to my dismay, I learned that there were several "bugs" yet to be worked out of them. (Beware of low serial numbers.) It failed to do just about everything, and some new stuff I'd never seen a pistol do before. (It would strip a round from the magazine, eject it from the pistol and close on an empty chamber. ) I phoned Sig Arms customer service and sent the pistol back to them, and they replaced it with a brand new one. The newer one was better, but still had issues, mostly fail to feed, fail to extract / eject, regardless of the ammo used. I pretty much designated the pistol a "safe queen" and forgot about it. Fast forward to a couple of months ago when I read something about the Mosquito on a gun forum, but other owners said theirs functioned flawlessly. I decided to give the little pistol another chance, but before taking it to the range, I emailed Sig Arms CS again. Their recommendation was to oil the heck out of it, especially the extractor, for which a hole is drilled in the slide. Being old school, I'd always been taught to use only light oil on semi-autos to prevent lint clogging. Sig also suggested that I clean it after about 200 rds, and that Mosquitos really, really like CCI Mini-Mags. Last week I took it to the range and after slathering the action and extractor with oil, my little Mosquito ran flawlessly. As a test, I ran a mag of Brand-X ammo through it, causing it to hiccup and fail. The next mag was filled with Mini-Mags, and it ran perfectly.