I just signed up for the board. I see James is here. I am trying to get some people toether right now to get a run of 12 gauge custom barrels.I currently have a 1 in 84 twist barrel being fitted, I hope to fire it next week. The land diameter will be .719", and the rest of the specs are up to you. Rate of twist, rifling depth, number of grooves/lands, and possibly gain twist. Let me know roughly what you are looking for, and I will talk to the maker about it. Greg S