Len uses the Leica's Laser Locator Plus
and I beleive he got his for $6100 - $6900, somewhere in that range. It's basically the civilian Vector IV. It, the Vector and the Riegl FG21-LR
are basically in the same class and price range, i.e. 6-10K and all are easily +2000 yard capable in daylight.
Len told me he gets beyond that with his but I forget just how far, but it was way out there and he seemed happy this wasn't a limiting factor any longer.