Thoughts on this malfunction?
This one is a bit of a head scratcher to me. I’m on day one of a four day training course, rifle is running great for most of the day. Throwing a nice neat pile of brass to the 4:30, running like a sewing machine from 0800 until around 1:30.
I’m estimate about 300-350 rounds fired to that point.
First malfunction is a failure to go into battery. Did not strip the next round from the mag and just got stuck about midway through the cycle. I do immediate action and keep going through the rest of the drill just fine. Then I get the same malfunction again twice in a row in the next drill.
Bang-failure to feed-immediate action-bang-failure to feed-drop magazine and replace with a new one. Gun runs fine for another magazine.
I pulled the original magazine out of the rotation and chalk it up to being an old mag.
Next two mags run fine, and then the fun begins.
Failure to feed, same way, two more times. And then I start seeing the bolt has partially stripped the cartridge, but impacted it against the feed ramp.
At that point, the trainer checks the rifle. Had block (pinned) looks ok. Bolt is shiny with lube. He does immediate action and fires the rest of the mag without issue.
I set that gun down and grabbed my backup rifle to finish out the day. I just got doing cleaning everything g up and can’t seem to find anything that would cause something like that. Any thiughts?
Edit: I did not lube the gun at all during the day. I topped it off with some slip2000 the night before and just left it alone.