Had one once, these are the worse!Learn how to clear a "Bolt over ride" and "double feeds", I haven't looked on you tube, but I'm sure there are vids of how to do it correctly...
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This is a bolt over ride w/ a double feed...
* the best way to clear it is to put a flat head screw driver, or leatherman type tool, on the bolt face, and pull back to the rear...
Please note, this will very hard to do, and what ever you do, DO NOT pull on the charging handle, or "hammer" the weapon on the ground, this will just make it worse, and it will be in there tighter than nuts on a new bridge.