I have a mark 8, it has been a great optic. There is just not much love for leupold on the hide... mtncreek has the good info on mark4's, they are being phased out due to old tech, not because they are going to jack the price up through one dealer. Leupold has to finish its military contracts before it can drop them completely. I have a mark4 as well despite what the negatives you hear I beat the shit out of both and they have performed flawlessly. 4500 is pretty high you ought to be able to find one at a good dealer for around 3799.99. I never have understood why everyone bashes leupold on the hide. In my own experience 12 years on a mark 4, and 3 years on a mark 8 they are competitive scopes. Maybe next time I'll drink the koolaid and try a bender, or a nightforce they are good optics and I shoot with a lot of guys who run them, or maybe I'll just keep buying leupold they have been good to me.