Interesting, I thought it was only Denver, as the state capitol. Still, a law was passed to prevent the patchwork of gun laws and make them uniform throughout the state so people didn’t commit a crime by crossing into the next jurisdiction.
Denver's restrictions on transport/possession of firearms in vehicles do not apply to persons traveling to or from other jurisdictions; see Trinen v. City & County of Denver, 53 P.3d 754. (4th from the bottom in the Summary Table)