"I bought one 10 years ago and had problems with extraction right off the bat. K/T replaced the extractor spring and the gun has not malfunctioned in about 1000 rounds. I replaced the recoil spring with a 13lb. from Wolff and also replaced the magazine springs. Considering the price of ammo you will probably loose it before you can wear it out. I dont' have any experience with the newer ones (I don't care for the extractor at all), but if it didn't work I think they would have replaced it by now."
Exact same experience for me, but I have about 1300 through mine. It gets carried almost every day, shot a bit about 3 or 4 times a year. Always goes BANG.