I just purchased a used Kimber, a Custom LW full-size with an aluminum frame in .45 acp. I shot about 100 rds through it this weekend. I had a malfunction twice, the same failure to go fully into battery. Now, this was NOT a failure of the round to go into the chamber. both times the round was seated fully and squarely in the chamber and flush with the extension/ hood on the top of the barrel. the slide stopped about 1/8 of in inch out form closing completely and was stopped hard. Pushing forward would not close it. and oddly, the extractor hook was not hooked on the case rim but pushing up against it. I believe the barrel was refusing to cam upwards into its locking lugs, but I dont know this platform well. I could not disassemble there as I was shooting in the middle of a snowy field with to table, I cleared the jam by locking the slide back and dropping it. It forced the barrel closed. later disassembly did not reveal any obvious blockages or damage to the barrel link, and it shot many rounds normally before , between, and after the two failures. Any suggestions what might have caused this?