Nice Old Luger

[DavidJayUden]

I'd suggest removing the set screws to determine if the barrel is free to come out then. If not they may be there to stop any rotation of the threads, as this barrel doesn't have the "shoulder" to butt up against the extension. If, on the other hand, if they are removed and the barrel pulls out , then it is probably time to hang it up.
dju

[John Sabato]

Originally Posted by DavidJayUden

I'd suggest removing the set screws to determine if the barrel is free to come out then. If not they may be there to stop any rotation of the threads, as this barrel doesn't have the "shoulder" to butt up against the extension. If, on the other hand, if they are removed and the barrel pulls out , then it is probably time to hang it up.
dju

Sheepherder, If the barrel threads in, then the set screws would not be the only thing holding the barrel in place... however if, as David has suggested might be the case, the barrel is just a pressed in fit, and the set screws are the only thing holding the barrel in place, this receiver is toast.

David I agree with you, It looks to me that it was a former .30 caliber rifle barrel that was used which had sufficient diameter for threads, but insufficient diameter to create a shoulder. Set screws might not be an elegant "bubba" solution, but I don't believe a screwed in barrel with set screws to prevent rotation would be a dangerous situation.