FX Impact X Picatinny Rail Question

I read a forum post from a year and a half or so ago that said the rails on the Imapcts were not actually made to specs, and there were issues mounting uni-mounts to them due to the design.

Does anyone know if anyone this is also the case with the X's? I have a 30mm Warne uni-mount for my scope - hoping I won't have to get individual rings to mount it!