For any of you looking for a lower profile option than the factory picatinny rail to mount an optic utilizing a Trijicon RMR footprint, check out MachineCraft Replicas' R8R.
The fit and finish are perfect, and Dakota is a great guy to work with.
Here's my M&P R8 with a Trijicon SRO mounted; I previously ran an Aimpoint H2 on the factory mount, but it was just too cumbersome for my liking.
The fit and finish are perfect, and Dakota is a great guy to work with.

R8R RMR Mount for R8 and TRR8 - MachineCraft
The R8R is the first and only low-profile RMR footprint mount for S&W R8 and TRR8 models. Precision machined from 7075 Aluminum and Type III Hardcoat Anodized.
www.machinecraftreplicas.com
Here's my M&P R8 with a Trijicon SRO mounted; I previously ran an Aimpoint H2 on the factory mount, but it was just too cumbersome for my liking.