In the case I posted above, I can't remember for certain who made the barrel, but it was likely a GRRW .54 cal x 1" parallel octagonal barrel. I made the breech plug and standing breech tang, and the lock. I had a brand new set of Roubideaux's plans and was using the info from them for the parts. I made the triggers too. All this was hack-saw and file work. It broke my heart to see my creation destroyed, but I was thankful no one was injured. I know it was a double ball load, and only one of them was seated.