If it's moving forward but not revolving, then I'd say the barrel has been installed as a press or slip fit and not screwed in.
I also agree that it looks like a revolver barrel and having moved out, it's not safe.
Take it to a qualified gunsmith and do not attempt to fire it again until it's properly repaired.
Listen to G.T. as he knows what he's talking about. I highly recommend him if you want it repaired properly.
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