Here's some more pictures of the Mosquito.
I decided to take the grips off to clean out the rest of the white "packing goo" that the pistol is shipped with. Some of the white goo can still be seen in these pictures.
The mag release button and mechanism will just push right out this side.
Spring at the rear:
In using my Mosquito lately, I've learned a few things, some of which I've mentioned elsewhere:
- Switch the front sight to the tallest of the three;
- The gun may be shipped as mine was, with the rear sight moved to the left. Move it right to the middle by turning the screw on the rear sight toward you (if you are pointing the gun away from you);
- If you get those two things right, the gun starts to get a lot more accurate

.
- Just use the longer (weaker) recoil spring no matter what ammo you use;
- Use CCI Mini-mags or Velocitors for the first few hundred rounds. After that Stingers and Standard Velocity work flawlessly as well. No guarantees on any other brand of ammo;
- Unlike the P22, the barrel sleeve cannot be seperated from the barrel on a Sig Mosquito. The only way to do anything with the barrel is to remove the whole barrel assembly from the frame of the gun. This can be done by removing the two screws at the front.
- Occasionally check the screw that is exposed when you turn the take down lever to the take down position. It should be snug. If it isn't you could get some movement in the barrel.
The gun has been working great. It's not as fast shooting as the P22, but it seems to be slightly more accurate (just slightly though). The difference in speed is the trigger. The Mosquito has a fair bit of take-up in the trigger even in single action, whereas the P22 has very little take-up so it is BAM!BAM!BAM!BAM!
If there was ever a problem with these guns, I have certainly not experienced it. Like the P22, the Mosquito is 500 bucks very well spent.
I'm really hoping that Glock, HK and some of the other companies get off their high horses and come forward with their own factory .22LR pistol. Apparantly the P22 and the Mosquito have - despite all the #####ing online - been huge sellers in the States. They are also both really fun guns. The temptation for the other companies to get into this end of the market must be growing.