I just got a good deal on a new Sig Mosquito, or so I thought. Took it to the range and it has some real issues with FTF / FTE and stove piping. So I did some research. Some (including Sig) say to only use CCI Mini Mags... I have about 8k rounds of .22 LR HV but not a single round of CCI and can't seem to locate any. I saw video after video that said the problem is with the feed ramp. They all said to file the ridge down and polish the feed ramp and it will reliably shoot about any HV round. The owner's manual said you can change the recoil spring (included) and use a lighter load. So... I took the barrel off and did just as the videos suggested and filed the ridge down and polished the ramp. Took it back to the range and tried again and it still won't shoot a full magazine (10 rounds) without multiple FTE/FTF or stove piping. Tried three different ammo and both the springs and it just will not work. I bought it new but I am reluctant to send it back to Sig since I have modified the ramp slightly. Does anyone know this gun or know anyone that can take a look at it for me and maybe make it work... gunsmith maybe...?