Since this version of the rail has the sling loop cutout the designation is GKR-10MS.
Installation was pretty straightforward and not that difficult save for the layers of rattle can paint built up on my handguard retainer. The front locking piece is not toleranced for the extra material. The fit is very precise. There is no wobble in the handguard once fully installed.
http://instagram.com/p/BrFmiAqn2EZ/