Check out M14 dot com, there's a whole list of "health checks" in a sticky thread that address the common problems and fixes. Seems that jams caused by cartridges hanging on the shoulder before the rim clears the magazine feed lips are common and usually related to not pushing the shoulder back far enough on reloads. We're used to sizing just enough to freely chamber, but apparently the spec between feed lip and barrel is set off of the SAAMI minimum. I need to read up on how to properly grease one myself, apparently oil is a no-no on the bolt and op rod raceways and grease is necessary for proper function.
Gear