Thanks for the response.
So, if I understand correctly, the convertible model that comes with both cylinders (45LC and 45ACP) is somehow different than the model that comes with only one cylinder, either LC or ACP? So, I couldn't just buy an additional cylinder and put it in the gun, without having it fit by Ruger or a gunsmith, is that right?
Sounds like I'd be better off just to find a Vaquero chambered in .45ACP to start with, if I can, rather than try to convert one. The reason I asked is because I see the .45LC models all the time, but I have yet to see one that is .45ACP; I don't want the LC model because I have lots of ACP ammo and no LC ammo.
Of course, these days you can't find ACP ammo, and everyone has LC ammo.