Re: So I ordered a Remington R5 - now what?
I'd like to toss you a little more input here-
If at all possible, get separate scopes, and do not use a QD mount on your bolt gun. First, cleaning a bolt gun is a lot easier than your OBR, so you really don't need to remove the scope for cleaning purpose, you also won't be pulling it off to use BUIS. Second, it just adds one more link in the chain- yeah yeah I know... larue and repeatability... It doesn't matter- the goal is to make your chain as short as possible so there are less links to brake. I have an OBR myself with a larue mount. Works well, but I would never put one on a bolt gun.
Also worth considering are the limitations of ring/mount height with the larue set-ups. You will either end up too higher on your bolt gun or too low on your OBR since the individual rings by Larue are, as I recall very short.
Anyway, if you MUST go this route, be sure your base is 20MOA- that will match the top rail on the OBR so as you swap between the two you won't have a huge amount of elevation change that you would if you went 0MOA.
But again I'd like to reiterate- scopes should stay with individual rifles, and I see no good reason for QD mounts on a bolt gun.
Good Luck!