It is possible to rebarrel using barrels from some of the guns made in Spain.
My firing pins are 1 or 1.05 inches center to center. I found 3 separate sets of 12 gauge barrels that I have fitted to each of my guns. The Hadama also has a set of 16 gauge barrels.

The 16 and one set of 12 gauge barrels are slightly undersized accross the breech face. Only one of the barrel sets have a third bite extention, but I don't think that the third bite would be necessary. There are plenty of guns that are shot every day with only the double bite.
Eventually, I will cut into the rib and silver solder a third bite extention in, just for the aesthetics.

I was going to start a thread showing the fitting, but I haven't got around to it yet (I do have the pictures already).
The first took about 4-5 hours with lamp smoke and a set of files. I just wanted to do it the old fashioned way.
The next set took less than 2 hours as I moved to some mechanized tools before I went to the files for final fitting.

Last edited by oganza; 02/20/12 03:43 PM.