I've been searching all over the internet for a definitive answer on this. Some say no, and some say yes. I couldn't find anything definitive on Co DOW website but I did find an on-line brochure put out by them that implies red-dot scopes are "good to go" for hunting elk in dark timber. To me this indicates CO has no problem with them since they are battery driven (except for many of the Trijicons), but I'd like to see something definitive. Can someone point me to a definitive CO regulation that says you can use illuminated reticle scopes, such as the Nightforce NXS, in Colorado for big game?