The barrel comes fitted to the barrel channel but the Breech
needs to be squared. Below is the result of a couple of hours
worth of fussing over the fit. I needed to go slow and make
sure the breech butted up to the stock perfectly, no gaps.
Candle soot shows a perfect octagon shape on the breech end
of the stock. So I'm happy.
A perfect fit! If you look close, you can see a mark on one of
the barrel flats that marks where the face of the 1/2 inch
Breech plug will end up inside of the barrel. This
measurement is important when fitting the Lock.