If my searches are correct we are talking Major OD of colt threads at 550" and Security Six bbl at .560".Charles L. Cotton wrote: ↑Thu Jun 28, 2018 7:30 pmI'm just guessing here, but I wonder if the barrel could be sleeved with a sleeve that was threaded inside and out, then pinned into the frame.
Chas.
There is not enough materiel to put two sets of threads ID and OD in a .010 thick bushing
Welding the Colt barrel and then turning to size, then single point cutting threads is not a hard machining task for an experienced machinist, though Id bet most machinist would need to outsource the welding part.
A very good firearms builder though can do it in house.
Thinking it though, Im not sure how I would chuck the barrel up..likely make a mandrel for the bore for alignment but drive the part with a lathe dog type deal