Are suppressors legal in Colorado?
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Yes — a suppressor is legal to possess in Colorado if you hold a valid federal permit and license for it. Colorado defines a "firearm silencer" as a "dangerous weapon" under C.R.S. § 18-12-102, and knowingly possessing a dangerous weapon is a class 5 felony. But the same statute gives an affirmative defense to anyone who has a valid federal permit and license, so a suppressor lawfully registered under the federal National Firearms Act (NFA) is effectively legal to own in Colorado. Colorado has no separate state suppressor ban of its own.
How Colorado treats suppressors
Colorado does not have a standalone statute banning suppressors. Instead, it folds them into a broader "dangerous weapon" possession offense. A firearm silencer is one of the listed dangerous weapons, alongside machine guns, rapid-fire devices, short shotguns, and short rifles.
(1) As used in this section, the term dangerous weapon means a firearm silencer, machine gun, rapid-fire device, short shotgun, or short rifle. (2) As used in this section, the term illegal weapon means a blackjack, gas gun, ballistic knife, or metallic knuckles. (3) A person who knowingly possesses a dangerous weapon commits a class 5 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.
The federal-compliance affirmative defense
The key is subsection (5). Possessing a dangerous weapon is a class 5 felony unless the possessor either is a covered official acting in the line of duty or "has a valid permit and license for possession of such weapon." For a suppressor, that permit and license is federal: suppressors are regulated under the federal National Firearms Act, and one that is lawfully registered under the NFA falls within the affirmative defense. In practice this means a suppressor, short shotgun or rifle, or machine gun is effectively legal in Colorado when it is lawfully registered under the federal NFA (or possessed by a covered official).
So there are two conditions, and both matter:
- State statute: § 18-12-102 makes bare possession of a suppressor a felony, but supplies the affirmative defense for a valid federal permit and license.
- Federal law: the suppressor must actually be registered and possessed in compliance with the federal NFA. Without that federal compliance, the affirmative defense does not apply and the state felony stands.
What this means practically
Colorado adds no extra state registration or permit step of its own beyond federal NFA compliance — there is no separate Colorado suppressor license. A suppressor that is not federally registered is an unregistered dangerous weapon, and possessing it is a class 5 felony under § 18-12-102(3). For how this offense fits into the wider penalty picture, see Colorado gun charges and penalties.
This page describes what the statutes say; it is not legal advice, and it does not walk through the federal registration process. Because compliance turns on federal NFA requirements as well as state law, consult a Colorado attorney or a licensed NFA dealer before acquiring a suppressor.
Common questions
Do you need a permit to own a suppressor in Colorado?
Colorado does not issue a separate suppressor permit, but you need a valid federal permit and license — a suppressor lawfully registered under the federal National Firearms Act — because that federal registration is the affirmative defense to Colorado's dangerous-weapon offense under § 18-12-102.
Is a suppressor a felony in Colorado?
Possessing a firearm silencer is a class 5 felony under C.R.S. § 18-12-102(3) unless you have a valid federal permit and license for it. A suppressor registered under the federal NFA falls within the statute's affirmative defense.
Does Colorado have its own suppressor ban?
No. Colorado has no separate state suppressor ban. It treats a firearm silencer as a "dangerous weapon" under § 18-12-102, and possession is lawful when it is federally registered under the National Firearms Act.