I'm trying to determine the vertical distance from the top of the LRPV receiver O.D. to the top of the barrel O.D. Unfortunately, I don't have the rifle in front of me to measure.

This is in order to select the right scope rings. I know the height of the mount, the dimensions of the scope itself, and the O.D. of the barrel (1" non-tapered). If only I knew the diameter of the receiver I could work out much ring height is required for the objective bell to clear the barrel.

Thanks in advance for your help.