Took my AR10 out to a carbine course (read about it here: link) Approx 400 flawless rounds fired in the class. Haven't cleaned it since the course, but I took it out to the range today anyway. Before I started shooting, I put a couple of drops of oil (about 6 drops) in the bolt carrier holes as Kyle Defoor demos in one of his YouTube videos.
Other than a different stock and pistol grip, everything is OEM. Running 20 round PMAGs and Hintenberger surplus ammo.
Started practicing some drills and about 60 rounds in had a failure:
Fired a round, felt some peppering on my support arm and the bolt locked back. Went to do a reload and hit the bolt release, but the bolt wouldn't run forward. The release button was "dead". Removed the mag and saw that the bolt carrier had somehow bound up in the rearmost position (about 1/8" behind the bolt catch).
Tried to wiggle it loose with my finger and a bic pen, but wouldn't go. Took removing the front take down pin and wiggling the two receiver halves to get it to release and run home. Fired a few more rounds (about 40) with no more issues.
Anyone know what happened, and what the fix would be to prevent this in the future?
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