Allen, no signs of brazing on it at all, nor any copper. I got this from a Russian and presume he got it somewhere in Russia.
>I think I'll have to build me one of those with the traditional ignition.
I have in mind a 12-barrel, 1 inch bore, handcranked machine with one cam-actuated hammer, on wheels You shoot it about once an hour since you spend most of the hour loading it.