Originally Posted by
Mark W.
I built a rack similar a while back and I used a wool blanket cut into strips and glued to the inside of the notches to avoid and wood to wood damage. Worked very nice. Since you didn't plan on that you could use craft felt it being thin would still protect but not use up to much of your space for the butt stock to fit into.
If you do paint it you might also go to the effort to put a strip of cheap white LED lights along the top to shine down on the rifles. Then just put a narrow face board along the top to hide it from view and to keep any glare out of your eyes.