John,
My first thought went to forging but after seeing "A Family Heirloom"(another post) it becomes obvious to me that I was in error and because I made too quick of a judgement I just deleted my error.
Because after due consideration, I would presume that the barrels were drilled and rough turned from round stock, before being stress relieved and returned to the shop for the final machining, etc.
ViggoG
|