[lugerholsterrepair]

Rich is correct...The "cannon" assembly should slide right off the frame, since there is nothing holding it on...
Push the toggle down and move the top cannon forward. The only snag you should run into is the toggle hook dragging accross the hold open. Just do it with care in case the holdopen is not into it's well as it should be.

Both of the severly rusted Lugers I made into shooters had to be beaten apart with a wooden dowell and a sledge hammer.