And I thought I needed a score card to figure out CZ model variations 
I was looking at a pile of M&P pistols at a local gun dealer this morning. And it was a pile. I liked the Shield Plus (large capacity version). When I got back home to do some more research I got rather confused. I have read that the "M&P" line has moved from version M.1 to M.2 with whatever improvements that entailed. The non-Plus Shield the dealer had was stamped M.2 on the slide. The Shield Plus - I am not sure. I do not find any pictures of the Shield Plus with the M.2 marking. Which makes me ask...
Is there such a thing in production as an M.2 Shield Plus? and is it worth seeking out over a Shield Plus without the M.2 marking?
Also... Looking at the pictures in the owners manual on the Smith web site it appears that the rails on which the slide moves are steel or stainless rather than an aluminum alloy chassis as used my many other manufacturers. Can someone confirm this?
TIA,
Ken

I was looking at a pile of M&P pistols at a local gun dealer this morning. And it was a pile. I liked the Shield Plus (large capacity version). When I got back home to do some more research I got rather confused. I have read that the "M&P" line has moved from version M.1 to M.2 with whatever improvements that entailed. The non-Plus Shield the dealer had was stamped M.2 on the slide. The Shield Plus - I am not sure. I do not find any pictures of the Shield Plus with the M.2 marking. Which makes me ask...
Is there such a thing in production as an M.2 Shield Plus? and is it worth seeking out over a Shield Plus without the M.2 marking?
Also... Looking at the pictures in the owners manual on the Smith web site it appears that the rails on which the slide moves are steel or stainless rather than an aluminum alloy chassis as used my many other manufacturers. Can someone confirm this?
TIA,
Ken