Opinions? TR20-2G 3-9x40 Riflescope, Mil-Dot Crosshair with Green Dot

Hey guys,

I have a 20 inch youth 700 in 308 coming. I want to set it up as sort of a “Mountain rifle/handy precision rifle.” However, I like the idea of having ranging capability and would like to familiarize myself with mil-dots, etc. Any suggestions? Any reason why this would not be a good scope for me?