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8/12/2013 8:39:09 AM EDT
Your rifle chamber a round without getting the extractor over the rim? This happened to me the other day, it was odd. Put mag in, rack charging handle, bolt didn't seat all the way. I thought that was weird, dropped the mag and pulled the charging handle to reveal a loaded round in the chamber but the extractor didn't go over the rim, leaving the round in the chamber when the bolt was pulled back.
As I didn't have a rod on me (I know this is hard on the extractor), I just let it slam home on the chambered round, it seated this time. Pulling the charging handle again and the round ejected just fine. Fed the next round into the chamber properly after putting the mag back in.
Any idea why this may have happened? Too much extractor tension? Potentially riding the charging handle (I may have done this by accident, not giving it enough spring power to properly chamber the round)?



I should mention this is on a well worn-in gun with roughly 10k rounds through it. No recent parts changes. BCM rifle.





 
8/12/2013 9:10:03 AM EDT
[#1]
Take the o-ring off the extractor if there is one.
8/12/2013 9:23:07 AM EDT
[#2]
Probably a one-off issue if it only happened that one time.

No worries slamming the bolt over an already chambered round, does not hurt the
extractor in this design as that is what happens during a normal cycle anyway.

On a 1911 and similarly designed weapons, it can 'sprung' an extractor doing that
as the round is designed to ride up the (open from the bottom) face of the bolt face and under
the claw of the extractor during normal cycling. When a round is already in the chamber and
you slam the slide/bolt forward to forces the extractor to snap over the rim causing undo
stress on the part.

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