I don’t wax the inside of the barrel, but after cleaning the barrel I use either Flitz or Mother’s on the inside of the barrel, the use patches to remove and finish with a patch of oil. Not sure if it helps or hurts. It does appear shiny.
I did coat a cz pistol with ms moly years ago. It started jamming. I sent it off to CZ and when it was returned they noted it was the dirtiest pistol they had ever seen. At that time moly was advertised as a miracle dry lube. No so.
