Scope mount for RRA LAR-8

[LeverGunJunkie]

I just received my LAR-8. Quick question on scope mounts: Can anyone tell me if the .308 upper requires a different picatinney based mount than a 5.56mm based flat top upper? Is there a difference in rail width? I'm guessing no, but wanted to check with some experienced folks before doing cheetah flips. Looking at the Burris PEPR mounts. Seems pretty good for the price.

 

[TonyAngel]

The Burris PEPR is a pretty nice mount, as is the Armalite. The rails on the uppers should be the same, but I can't account for the manufacturing tolerances of the RRA.