As for “inability to install a gun safe”, at least for “legal purposes” you could get a cheap Stack-On gun safe that is made to go between studs in a house, it locks and could cover your butt. There must be a way to be “legal”. If not actually secure… the cheap gun “safes” like that are not very secure.
"ROGUE ELECTRICIAN" Hoping to be around to re-energize the New World.....
Cogito, ergo armatus sum