The argument was that under federal law, such guns are not "firearms" in a prohibited sense.
The short answer is no. And don't ask about archery either.
Colorado Division of Wildlife spokesman Randy Hampton discussed the law as follows:
Colorado State Law was amended in 1994 to prohibit the possession of a firearm or other weapons (pursuant to Colorado Revised Statutes Title 18, Article 12). It was also amended in 2000 to make such possession a class 6 felony instead of a class 1 misdemeanor. The beginning wording of CRS 18-12-108 is,In regard to archery, he added,
(1) A person commits the crime of possession of a weapon by a previous offender if the person knowingly possesses, uses, or carries upon his or her person a firearm as described in section 18-1-901 (3) (h) or any other weapon that is subject to the provisions of this article subsequent to the person's conviction for a felony, or subsequent to the person's conviction for attempt or conspiracy to commit a felony, under Colorado or any other state's law or under federal law.
CRS 18-1-901(3)(h) adds the following provision that covers muzzleloaders and shotguns: 18-1-901(3)(h) "Firearm" means any handgun, automatic, revolver, pistol, rifle, shotgun, or other instrument or device capable or intended to be capable of discharging bullets, cartridges, or other explosive charges.
Because 18-12-108 includes "firearm... OR ANY OTHER WEAPON that is subject to the provisions of this article," it also includes "dangerous" and '"deadly weapons." It is the interpretation of the Attorney General and the Division of Wildlife that bow and arrow are dangerous and deadly weapons, therefore, not allowed for possession of persons convicted of a felony.
I am posting this just in case anyone is searching online for the answer.