I'm not that handy but managed to get it on as per the instructions at: http://www.mod94scoperail.com/. Seems solid:
There's a backup rear sight and groove built into the rail which lines up with the tall front sight I had on previously, but the bushnell obscures the sight picture. No see-through. Oh well, cant have it all unless I raise the red dot, but I'd rather have a lower profile. I still have to confirm the zero then zero the red dot. More to follow whenever I get to the range.