approach 1, legal rp. stricter gun laws, nothing can be open carried (back, or in hands), make current concealed weapons show on the waistline or something.
approach 2, stupid, but add heavier escalation rules, current it goes as follows, ur mad at me, i punch you, you hit me with your gun, i shoot you dead bam. could make it something like fists can only be retaliated with the bud of your gun (and nerf the damage a fuck ton) or melee weapons
not my idea though and i came up with this out of my liquid asshole juice