Back in 2011 I had a rough patch and sold my M&P 9mm that I had bought in the previous year. Times are better now and last week I finally replaced my pistol. I noticed a couple of changes, one good, one not-so-good and one...meh..don't really care. The "meh" change was the filler plastic on the frame to fill the slots where the thumb safety goes. If S&W only wants to make one frame, OK by me. The good change I noticed was the trigger bar/sear engagement contact point. They are machining it from the factory just like the popular mod so that the sear is engaged later in the trigger pull. Now, on the the not-so-great change. Or, maybe it's not what I think it is and you guys can fill me in. That's the reason for the thread. I'm scratching my head trying to figure out why the slide stop elevator on the M&P magazines had been purposefully altered to not fully catch the slide stop tab. Here is an image (Sorry for the cell phone pics.) of one of my mags, that I bought in 2010, fully inserted into the frame. You can see that the elevator catches the slide stop tab and it is riding on top, as I think it should. Now here is one of the mags that came with the new 2013 model M&P9. You can see that the slide stop tab is being elevated so that it does catch the slide after the last round is fired. But the tab slides off to the side of the elevator portion of the carriage (if that's the right term). I know it's hard to see the details clearly (I have a really nice Nikon camera rig but it's in storage), but here you can see a top down view of the two mags side by side. The one on the right, with the read stripe, has a more square corner where the slide stop tab comes in contact, giving a larger contact area. The newer mag on the left is more rounded and you can see in the next image (the new mag is on the right this time) that the edge slopes away from the contact area. This clearly isn't a problem with alignment, as both magazines fit snugly in the magazine well. The shape of the part has been changed for some reason. I could understand if the old mags were not engaging the slide stop mags on three year newer gun, but it's the new mags with the new gun that look like this may potentially be a problem. Was there a problem with the old design that I didn't hear about that brought about this change? If nobody offers an explanation for this and it turns out that this is something that may lead to problems (like the slide stop not being elevated) later on, I have come up with a possible fix. It looks like it'd be really easy to scuff the side of the plastic (where the slide stop is touching in the second pic) and build up that area with a little 5-minute epoxy.