I could use a little help with a problem I am having with an M1 carbine. Occasionally it will fail to feed correctly. Sometimes the bolt goes completely over the next round in the magazine. Other times the round has started to feed but the bolt is smashing into the middle of the round. I would estimate this happens about every 1 out of 15 rounds. My carbine is well lubricated. It has this issue with two different USGI magazines. I have also tried two different brands of ammo and swapping operating slide springs. So, two different magazines, two different ammos, two different springs, and always well lubed, and nothing has helped.