One of the more interesting blogs with some really expert feed back. Truth is, you can carry just about anything and get away with it simply because the odds are that you'll never need it. So let's ignore that, true that it is. Departments went from revolver to pistol and did OK with transition training. A lot of guys didn't adjust (or didn't want to) and were allowed to keep their revolvers. And from Glocks (point and shoot) to, for example, Sig 226 where the first shot was double action followed by single action. And then remembering to decock. Totally different feel. But think about carrying on duty where the gun is exposed OTW and then transitioning to off duty CC with possibly IWB. Doesn't usually end up being a problem. And it's no argument that you act the way you train, stress being the big factor. This has been shown in a slew of Police Videos, and unfortunately a lot of the training wasn't very good. So to be on the safe side, though unproven, ideally you would carry the same gun, if possible, all the time and train with it regularly. For a cop carry your off duty at the 3 o'clock position, same as the duty gun. Glock or 1911, doesn't really matter. And if you like switching around, probably still doesn't matter if most of your training is with a 1911. When you shoot the Glock you'll thumb the slide safety which simply isn't there and get your shot off OK (ask me how I know this). For myself, I went from the Glock 19 back to a 1911 style gun, and almost always carry in the 3 o'clock position, OWB. OWB is just comfortable and easily concealable with my Milt Sparks leather holster, with a loose T-shirt with another T underneath. Sometimes I use a Kydex with leather lining and carry AIWB. I know, a different position, and am hoping that I won't inadvertently reach for my gun, under stress, and find it isn't there. But some situations I have found are better for one type of holster over another. And admittingly, will sometimes grab my Glock 43 and carry AIWB.