UnKnown barrel, any help?

[Mike in NC]

A friend has several of these barrels. They are a 9mm bore and about 8 inches long, but may be chambered for either a 380 or 9mm Makarov as a 9mm Luger round seems to stick out a little too far out of the chamber.

Here are some links to a few pictures:

Imgur: The magic of the Internet
Imgur: The magic of the Internet
Imgur: The magic of the Internet

Thanks for any help.

She wants to sell some of these, but need to find out what they fit first.

[RCS]

my guess is that the barrel is from a Madsen M53 sub machine from Denmark ?

[Mike in NC]

my guess is that the barrel is from a Madsen M53 sub machine from Denmark ?

Robert, I believe you are absolutely correct. That one had me really stumped. Thank you very much.

[browningautorifle]

a Madsen M53

Yes it is.