Hi alexmg2420, and welcome to the forum parabellum.. This is a great place for info, and also a great place to enlist aid for your ailing Luger... First of all, don't shoot it anymore? You will run into pierced primers and other excessive headspace maladies...
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It looks like an old revolver barrel to me, maybe it's all they had, when something is needed it's better than nothing?
If I was faced with a barreled receiver like yours, I would drill out the added retaining pin, and remove the barrel.. Then, I would run a tap into the receiver thread and straighten that out, and finally, re-barrel with a Luger barrel, new or used, of your choice.. If you would like to discuss the process that can make that happen, write me at:
gctomeks@msn.com I am always willing to help new collectors and shooters, especially that are members of this forum.. we can work something out... Best to you, and again welcome, til...lat'r....GT
