I'm getting a Larue OBR with a Nightforce 3.5-15x50 scope. The stock is a standard A2, and I want the scope mounted as low to bore as possible. Im thinking Larue LT719 rings (.875") but am afraid that the built in 20 MOA top rail might not provide enough clearance. Does anyone have any S.A on whether my set-up is feasible (am deployed right now, buying everything online an cannot handle the items)?