OK, that's better because your avatar picture looks to be a Barrett .50 not an AR-15.
Holy crap dude!!!!!!! Got enough scope on that thing? For that kind of long range set-up I'd definitely go with a 20 MOA one piece like the Nikon I posted earlier.
Yes, your scope looks like it's too far back, but if you move it forward much it'll overhang the end of the barrel.