I should have noted on the picture but did not, that the barrel's outside diameter at the breech, is 1". I cut 4" from the muzzle and found the barrel wall thickness was only about .20" thick on one
side but close to .125" on the other, iirc. That was disturbing. It kind of made me wonder if there were any other thin sections, close to the breech. The barrel was straight, thus had been
ground or sanded on belt sanders to get the taper.
The barrels are made from 'seamless tubing', which I suspect started at 1". The stock's machine screws (sling swivels, etc) were almost (but not quite) one size too small for the holes they were
fitted to. My lock sparked very nicely, but I had to grind off the cross-grooves they had chizeled or ground into the face of the frizzen. These gouges were 1/16" deep, and of course would
shatter a flint first strike.
The rear shield I noted, is a flat plate behind the threads. This plate is 1" in diameter and the threads hold it against the rear of the barrel. This 'shield' is what kept the gun from blowing up, I
assume, with the first shot. I nearly went into convulsions after I de-breeched it for inspection. The 'threads were completely filled with fouling, almost level with their peaks.
I would suggest no one buy one of these. Buy a Pedersoli instead.