good to know info so if i ever get another 1 but don't have one now
When I had m&p 9c I tryed that did not work I had a Ma one that could not pull the trigger with out the mag ,
It does work, you just needed to think outside the box. Clear gun (check it again and again to be sure), open slide, flip lever down, close slide, re-insert mag, drop striker, remove mag, remove slide. I know this works because I just tested it 2 minutes ago. (I don't own an M&P, but I am babysitting one).
BTW there are/were MA compliant SKUs that don't have the mag safety in them. It is not required for compliance.
-Mike