The MKIII is designed to workwith the mag safety so that the firearm can fire only with the mag in, my understanding is if you remove the mag safety from the MKIII you can use previous model magazines.
MKIII 22/45 magazines have a cut out near the top left hand side (as viewed from the rear). This is a clearance cut for the MKIII trigger.
MKII 22/45 magazines do not have this cut out (the MKII trigger is slightly different from that of the MKIII)
The catch shelves are slightly different, as are the follower buttons
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