Speaking of the Radius... they must not be selling many of these or this is merely a way to blow out soon to be discontinued product/model. From over $900 to $400, and from Brownells... infamous for overcharging. The nerd in me wants it, but I know for 110% that I don't need it.
Radius Rail Mounted Rangefinder : SILENCERCO RADIUS RAIL-MOUNTED RANGEFINDER | Brownells