Perhaps I should just post the CRS so you can read it and understand it for yourselves.
18-12-102. Possessing a dangerous or illegal weapon – affirmative defense
(1) As used in this section, the term “dangerous weapon” means a firearm silencer, machine gun, short shotgun, short rifle, or ballistic knife.
(2) As used in this section, the term “illegal weapon” means a blackjack, gas gun, metallic knuckles, gravity knife, or switchblade knife.
(3) A person who knowingly possesses a dangerous weapon commits a class 5 felony. Each subsequent violation of this subsection (3) by the same person shall be a class 4 felony.
(4) A person who knowingly possesses an illegal weapon commits a class 1 misdemeanor.
(5) It shall be an affirmative defense to the charge of possessing a dangerous weapon, or to the charge of possessing an illegal weapon, that the person so accused was a peace officer or member of the armed forces of the United States or Colorado National Guard acting in the lawful discharge of his duties, or that said person has a valid permit and license for possession of such weapon.
“or that said person has a valid permit and license for possession of such weapon.”
Who is going to issue said license or permit if the ATF doesn’t? Colorado surely isn’t going to permit silencers given our current political makeup.