Ok so my scope did not come with TBR it is a leupold RX-I But does register LOS. My concern is this. If my scope reading LOS only above the angle say for instance 40 yds is TBR really 34 Yards that is a big difference if you ask me when in a stand taking a shot at a 40° incline. This picture may help you understand my curiosity but this feature is only available from RX-IIan up. As shown here in the picture an RX-II IMG]http://tapatalk.imageshack.com/v2/14/10/31/f0009d38c0bc3b29b5408849dae1d398.jpg[/IMG]