SIG mosquito .22! would not feed anything! even the factory recommended CCI hot ammo would jam, installed the lighter recoil spring which was suppose to help, didn't, polished the feed ramp, no help, gave up and traded it for a kahr cm9. then bought a ruger mark III 22/45 awesome little 22!
If "pro" is the opposite of "con" whats the opposite of "progress?"