I believe there are .22 conversion kits for other sig such as a P229, or a P226, why not get one of those and purchase a .22 conversion kit so you can use the same gun, but practice with a .22. Just my .02
The mosquito is nice, just a smaller version of the full size gun. I have heard great reviews on it. What is the purpose of the gun. If I didn't assume wrong, it is for range plinkering and practice am I correct?