Let me see if I understand correctly.
1. A round is stuck in the chamber.
2. The extractor is gripping the round but normal pressure on the handle won't move the carrier.
3. The carrier is stuck slightly open so the upper can't be tipped up.
If all that is correct, try this. Look up inside the front of the magazine well. You will see the bottom of the carrier and a gap between the front bottom of the carrier and the front of the magazine well. Insert a strong screwdriver into that gap and pry back on the carrier by pushing the screwdriver handle forward. If necessary, use a piece of wood or plastic as a fulcrum for the screwdriver. The carrier should move back and bring the bolt head with it.
Jim
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