@Big Uncle - help me understand the B&C rules, because they don’t make sense to me.

By this “no rangefinding optic” rule, I could have a Silencerco Radius on my forend and a Nightforce ATACR on top of my rifle, but I couldn’t have a Burris Eliminator. I can have a SigSauer Kilo on an arca mount bolted to my scope. In either case, I can see the output with my off-glass eye while I’m behind the scope, and it’s all mounted on the rifle...

Where’s the sense in that differential?