Golfswithwolves is right- John Taffin knows Colts- I have an older SAA Army in .45 LC-relative carried it in the Pershing venture into Taco-ville to bag Pancho Villa. I also have a 1851 Navy .36 cap and ball, which is fun to shoot on special occasions-can't say about any fourth Gen. Colts- or the re-birth of S&W- some of the gun writers in GUN DIGEST, ie: Dave Workman and Dave Morelli and Charlie Cutshaw would be good ones to ask as well- I have a 20 some year old Combat Commander in .45ACP that came from the CA pistolsmith Bob Chow-there are many expert pistolsmiths extant-any of them would be qualified also to answer your questions.