Check out New leupold vendetta rangefinder mount for crossbows this thing is awesome. Listed on ebay. Mounts rangefinder right beside scope, when you look thru. scope with both eyes open, you can see the yardage appear in the scope when you close your opposite eye it disappears, whatever you see in your scope just press preasure pad and yardage appears. Gotta get my dad one of these.

I assume your getting a plug in for your Vendetta rangefinder. I dont find the idea all that bad for open shots, I would however have to know how it would mount and how well i could be postioned to work propperly as well as if its even legal here in Ontario