Re: scope ring lapping
Probably not real critical but if you are a perfectionist, it can't hurt if done correctly.
A good quality set of rings and bases go a long way but if you torque the base down on an action that is not straight, the base will not be straight either.
I always start by bedding my bases to the action with a thin skin of epoxy. I hold it in place lightly so as not to stress the base if the action is not straight.
Once you have your ring position figured out, carefully torque the base and rings into position and check the rings with a lapping bar. Better rings like Badger, Seekins and Nightforce are usually pretty close, but sometimes it will surprise you.
I always check rings to see if they need lapping.