Hey guys. I have the latest 10 FCP-SR and am keeping the factory 0MOA base. I have a Vortex Viper HST 6-24x50mm riflescope. The objective bell radius is 28.7mm. I can't find the official dimension for the rail height. My calipers stopped working so my crude estimation for the mount height is roughly 3/8" (9.53mm) from the barrel. I am also looking to add Butler Creek flip up covers, add about 2.5mm to the equation. The rings I am considering are Seekins/Vortex Precision Matched 30mm Tube Rings .87" high (22.1mm). From my hand calc: 9.53+22.1-28.7-2.5=0.43mm of clearance. Does that seem right? Anyone have experience with these rings or ones with similar heights? Should I be looking for more clearance? Or am I overthinking this? lol. Thanks for the help.