Any chance you could post a pic of your setup? I would really like to use the UTG Hi Profile rings, but by my calculations they won't clear the rear MBUIS Gen2 (.51in) with my Nikon P-22, which has the same eyepiece outside diameter (44mm/1.73in) as your Nikon Prostaff 3-9x40.
My calculations:
MBUIS+(1/2)(EyepieceOD)-(1/2)(TubeWidth)=Minimum Saddle Height of rings
.51+(1/2)(1.73)-(1/2)(1)=.875in=22.225mm
The UTG Max Strength LE Grade Quick Detach Picatinny Scope Rings (2 Piece, 1-Inch Diam, 6-Screw Hi Profile) have a saddle height of only 20mm, which means they are 2.225mm short of being able to fit the P-22 over the top of the rear MBUIS Gen2.
What am I missing or doing wrong? Did you mount your scope where the eyepiece was in front of the rear MBUIS and not on top of the rear MBUIS?
Unless you can prove me wrong, I think I'm going to have to get a Burris PEPR mount or Burris XTR Extra High rings. Please prove me wrong!!!
Thanks a ton.