Matt Maggio wrote: "Jams - due to different feed angle and different mag latching system"
Matt, I do belive you and I have been threw this before. The feed angle, in relation to the bore line, of the MkII and the 22/45 is exactly the same. If you would compare the two pistols, you will see that the 22/45 accepts the mag at an angle steeper then the grip angle, making it identical to the angle of the MkII which accepts the mag at the same angle as the grip. Don't confuse the grip angles of the two pistols in relation to the mag angle. The mag angles are identical. As for the mag catch, you are correct, they are different. The problem most people have with a mag unintentionally dropping on a 22/45 is because they touch and / or bump the catch button on the 22/45. M1911 shooters don't have that problem because they have grown accustom to the location of the mag catch button. A stronger spring in the catch button on the 22/45 would cure that problem, for those that have a problem. I don't have that problem, so mine is still like it came from the factory. I use my 22/45 for the .22 portion of PPC matches at my local range. We draw from a holster, making the mag catch button vulnerable to unintentional drops of the mag. I have yet to have one problem with this happening. One just has to be aware of it, and it will not happen.