Mine is an early model and no matter what combination of mag catch, recoil/main springs, lubricants or ammo it will only feed reliably from 9-round magazines. It's even been back to STI to have the feed ramp recut, but it just seems to still prefer the 9 rounders. That's why I encourage others to experiment with whatever different types of magazines they can get their hands on as there seems to be no magic combination for this gun in the available 10 rounders. I've met a few other folks who've had this same problem so at least I know it's not just me having this issue.