I run 0 MOA rails on my guns. Unless you're really reaching out far, anything else isn't really necessary. I prefer to keep the cheekpiece as low as possible (you'll have to raise it up a bit due to the scope pointing up towards the back). But that's not a huge deal. I just prefer to leave it all flat unless you really need to do something different. Of course my CTR came with a 0 MOA rail, so I would've had to spend money on anything else, which was part of the decision also. If I had to buy a rail either way, it's probably 50/50.