Barh, I have my MBUS mounted to the absolute rear of the rail and in the stowed position. The prism scope I have has just enough eye relief that the rear of the objective tube sits just in front of the MBUS as stowed. Think you will need to see how much forward you can mount the prism and still have it usable. IMO the weapon works better, particular in CQB, if the prism or red dot is mounted as far forward as possible. Then you can see if your MBUS interferes. If so, you've already found the choices - remove or raise. Good luck.
Regards
Regards