You have to tell us where you are and show us a picture of the rib. The little bit of rib we can see is not from the Parker factory. The gun appears to be rebarrelled, but a better picture would comfirm that. One quick fix for the inability to take the gun apart is to fire the gun, empty. If the barrels don't come off, cock and fire the gun again. Often that will free the cocking slide to remove the barrels. When you get the barrels off, lubricate the cocking slide to help free it up. Don't worry about how to identify the cocking slide until you get the barrels off. Post pictures of the bottom of the breech end of the barrels when you get them off.
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