My M&P40 Core came with 5 separate mounting plates to accomodate: Trijicon RMR, Leupold Delta Point, Jpoint, Doctor, C-More STS, and Insight MRDS. Screws were included with the gun purchase for all these sights except the Trijicon. For Trijicon, S&W says to use the screws that come with the sight.
I mounted a Trijicon 6.5 MOA, and as stated above, it took about 1 minute. The Trijicon uses the type-1 plate (that came with the gun) and nothing else was required. It's a perfect fit and does co-witness.
I'm very pleased with the gun and how easy it was to mount one of the supported sights.