Pretty sure all they did was add the M2.0 stamp to the slide, as their website doesn't show the 'original' m&p shield 45 anywhere. It was built on the new platform anyways so I think it's kind of like when they had 'Stainless' on their slides for the 1.0 lines and then released the slides that didn't say it on there anymore. Mine doesn't have the 2.0 on it but I don't mind
still goes boom just the same.