Madsen M50 barrels.  Hand turned and fitted to our M50.  You may need to do final adjustments for your application. 

I’m running the chamber a little loose as the original design has the round igniting as it goes into battery.  If that hangs up along the way, you might have a bad time.  I don’t profess to be an expert on how to deal with it best, but I think this is safer.  Either way, try to keep your face out of the ejection port at all times.  The original design is primitive and there is necessarily some risk you have to accept in running these old sub guns.

I’ll make some more as time permits and they get gobbled up.