Colorado gun rights took a leap backward over the weekend as Democrat Gov. Jared Polis signed legislation essentially gutting the Centennial State’s firearms preemption law, thus allowing local municipalities to establish their own gun control laws.It returns Colorado to a checkerboard situation where neighboring jurisdictions might have different, perhaps conflicting gun laws that confuse, and according to some critics, possibly even ensnare gun owners into situations where they might be violating a local law by crossing an invisible jurisdictional line.At the same time, Gov. Polis signed another measure establishing an “Office of Gun Violence Prevention,” whose job will be to...