I'm curious why you need to have it at a certain height? As long as the bell clears the handguard that's all you should need, right?
I think that's right. I figure, low as possible to clear. Any lower than 3/4 felt uncomfortable to me. I got a good consistent cheek weld and I think that's the important thing. He DID say he has a FSB though, so now that I think about it, I may have to try it on my other upper to see if it'll work.