No, this Ruger Bisley Blackhawk is what they call a convertible since it has both a .45 Colt and a separate .45 ACP cylinder. From what I understand there are some gunsmiths that will modify the ACP cylinder so it can use the .45 Auto Rim or standard ACP rds.

Men you can't trust, women you can't trust, beasts you can't trust, but Bussekin steel you can trust