One tip....go buy one of those silicone impregnated socks and slide it in it before you put it in the safe. It ensures nothing can ding it or scratch it. I do it to all my rifles.
I cut a 1/2” sheet of plywood to the size I wanted and contact glued the closest colored felt I could find to match the inside of my safe on it. Then used angled shelf brackets to hold it in place made a nice little compartment for it.