Reno doesn't have anywhere near the same level of security that New Vegas does due to the Securitron's and such and the town is obviously a very volatile, dangerous place where a lot of people have enemies so I don't see willingly disarming that often being the norm. Maybe a handgun/sidearm only policy? That might be a nice compromise, I think certain illegal establishments in conflict zones in real life have that policy too, so it's not too unrealistic. At least if some brothel in Kabul I remember reading about is anything to go by... Though that was a long time ago. T'was quite possibly in a work of fiction... Still, it works.