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AR15 jam

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maanbr:
Had this one occur in an AR15 a few weeks ago.  The ejecting brass got stuck above the bolt after firing.  Any idea what would cause this.  Been firing these weapons for 12yrs now and have never seen it.  Got it cleared by pushing a screwdriver against the bolt face/carrier to the rear.  Pulling the charging handle just makes it worse.

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AAllen:
Seen one like that once back in the military, extractor spring was weak and the extractor was extreamly dirty and not able to freely move.  We removed the extractor cleaned it and it's seating area and replaced the spring and it worked fine after that.

maanbr:
The weapon was clean, and I fired a couple more mags after I cleared it without a problem.

FarmerRick:
I've heard(on AR15.com) about that happening, but never seen it myself.  I'd search there for possible causes and solutions.

Dan W:
I am guessing something like the extractor loses it's grip on the case just before the neck  clears the chamber. The fired  case has enough inertia to continue to the rear, when the neck hits the edge of the chamber, and forces the base of the spent case to go high in the rear, and it holds there just long enough for the bolt to move back toward battery, where the cussing begins, as the bolt wedges the base  above the bolt

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