I own several Sigs . All but 1 work great. I can't get my mosquito to work properly. I have read that you have to have the right spring / ammo combiation to make them work, and that if you hit on it they are great guns too. Can anyone give me their combo , if they have one that works well?
I can't swear by the spring, I just have the one it came with. Contrary to popular advice, I tried CCI standard velocity lead heads. 700 + rounds with no failures. 2nd best has been CCI mini mags - roughly 2% FTEs. Serious failures have been Federal anything - 5% or more FTE or FTF. My biggest problem has been that when I take the compensator off to strip and clean the pistol, I have to redo sighting it in from scratch afterward. The front sight seems to jiggle around a bit once the compensator is back on - never had to do anything like this with my Model 41.
They come new with a heavy and a light spring. I have the light spring in mine and it shoots Walmart Federal bulk pack very well. Any bulk ammo will have it's share of light/dud rounds so make sure you don't blame the gun too quick.
I've read all the bad press as well and I think Sig did have problems with the early guns, but mine is a definite keeper. I've had Rugers and Buckmarks and my little Sig is less ammo picky than those I owned. I put in the heavier spring and fired about 300 rounds of CCI Mini-Mag without problems as well...