I don't know the regs for using a crossbow in the archery season in Colo. but I know that if you decide to use it during a rifle season, they don't have any restrictions on sights. I still do shoot with pins (in rifle seasons) with mine here in Colorado because I like to keep both eyes open to see the bolt in flight (hard to do with powered scope). Pins have worked well for me but I thinka lot of crossbowsights aren't made to last (like mine when I got it) so I had to make my own to fit my crossbow.