M4 extended feed ramp dimensions?

Hey all,

I’ve been looking for the dimensions of the M4 feed ramps that continue into the upper receiver. So far I’ve been unsuccessful at locating this. I’ve got a basically finished modeled upper that’s going to be CNC’d in the next few months and I’d like to avoid taking a dremel and doing it imprecisely when I could just have it done in seconds while it’s being machined.

So, if anyone has it, please post it.

-Thanks,
Nerog