I've read that others use the compact as a Shield trainer; I can see it size wise and perhaps even holster wise (it may be possible some holsters may work for both guns?).
I have a compact .22 and compact and full size 9 so the Shield is the one MP i havent added to my little collection and some day i may choose to do so. My only thoughts for using one to train on the other:
- from the one time i handled a Shield, the safety is not the same as the compact. Yes they may both have one (depending on model of Shield), but i'd think for carry use if you have a safety you better train with that safety.
- i like the idea of a compact .22 as a general trainer for new shooters as it is easy to shoot and fun as well. But if i was ready to start carrying, i'd train with the specific gun that i would carry so i was fully confident with it. And treat range time with the other guns as practice/fun time.
just my .02 of course.