Lube iiside the ports with some penetrating oil preferably Kroil. Let it sit overnight. Wrap a leather belt or something else around the knurling to protect it from damage. Grab it with some vice grips and rock it back and forth. If it dosent give then lube it up again and wait another day. Try to rock it again. It will give up eventually. Once you get it working again close it after shooting it and give it a little shot of CLP and work it back and forth. It won't lock up again if you do this after shooting.
Good luck.
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