I've carried my Sig P220 for the last 25 years. Never had a feed problem that didn't trace back to the ammo. Labor day weekend I had it out at the range, shooting with a friend. At first it was fine. After about fifty rounds, it started having problems. Every few rounds the slide would stop just shy of fully forward. I took it apart when I got it home to find the slide lock spring broken in half. It was jamming the slide back. I have a new spring on the way from Brownell's. After 25 years of use, stuff happens. I'll order the rest of the springs next payday, and replace them all.