I am torn between a classic carryhandle sight and a Magpul MBUS rear sight for a Panther DPMS (carbine length, 5.56) I'm not sure how long of a distance the magpul sight will work if it has no elevation adjustment like the carryhandle. How would I know how to aim for different elevations? And what would be a good distrance to sight the magpul flip sight at? It is about the same height as the carryhandle is when it is set to "z". What's the Z stand for? And how do you compensate for various distances? I assume the magpul sight just works from 0-200 yards or Something? I really like it but I'm torn because the carryahndle can adjust for distance (0-600 yds) while the magpul can't.