Thanks for the kind words Rastoff. My thought was to keep dirt out as much as possible in the state in which it will mostly commonly be carried (safe). The tab doesn't protrude outside the frame, but seals up with the slide, sort of:
That said, there are so many gaps between the slide and...
I had three changes I wanted to make to the thumb safety on my M&P9c: increase the force required to move the safety to the fire position (more like my Colt 1911), cut off the right side paddle flush with the frame, and cut down the left side paddle width as much as possible. This is an image...