State SBR law

Are short-barreled rifles legal in Colorado? (2026)

By Cole Harlan, EditorUpdated Oct 28, 2026How we verifyEditorial standards

Colorado lists a short rifle as a "dangerous weapon," and knowingly possessing one is a class 5 felony. The way out is an affirmative defense for a person with a valid permit and license. The statute doesn't define that phrase, and we haven't found Colorado guidance on how it applies now that ATF has stopped enforcing registration for SBRs.

Not legal advice. This page summarizes Colorado statutes and federal guidance as of the date above. Local rules and your own circumstances can matter. Check with your dealer or a Colorado attorney if you're unsure.

The short answer

Possession is a felony. C.R.S. 18-12-102(3): knowingly possessing a dangerous weapon is a class 5 felony, and a short rifle is on the list.
There is a defense, not an exemption. Subsection (5) is an affirmative defense for a person with a valid permit and license for possession.
The key phrase is undefined. The statute doesn't say what counts as a permit and license, and we found no Colorado guidance on it.
Short rifle means under 16 inches or under 26 inches. That is a barrel under sixteen inches or an overall length under twenty-six inches.
Federal rules still apply. See "Federal process in 2026" below.

The statute

Colorado puts SBRs in C.R.S. 18-12-102, "Possessing a dangerous or illegal weapon." Read the section in the 2024 official printout of Title 18 (PDF). The key parts:

(1) The term dangerous weapon "means a firearm silencer, machine gun, machine gun conversion device, short shotgun, or short rifle."

(3) "A person who knowingly possesses a dangerous weapon commits a class 5 felony."

(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."

Because subsection (5) is an affirmative defense, it is something the accused raises. It is not written as an exception to the offense. Section 18-12-102 has no exception for federal firearms licensees.

How Colorado defines an SBR

Colorado calls it a short rifle. C.R.S. 18-12-101(1)(h) defines it this way:

(h) Short rifle: "means a rifle having a barrel less than sixteen inches long or an overall length of less than twenty-six inches."

Those are the same 16-inch barrel and 26-inch overall lines as the federal definition in 26 U.S.C. 5845.

Penalty

Class 5 felony (C.R.S. 18-12-102(3)). We haven't verified the sentencing range here, so check the Title 18 sentencing provisions or ask an attorney.

Is legality tied to federal registration?

Not by name. In the sections we read, C.R.S. 18-12-101 and 18-12-102 never mention the National Firearms Act, ATF or federal registration. The only defense that could fit is "a valid permit and license for possession of such weapon," and the statute doesn't define that phrase.

The statute doesn't say whether an approved federal form counts as that permit. ATF's October 9, 2026 open letter says it stopped enforcing Form 1 and Form 4 approval and registration for SBRs, SBSs, suppressors and AOWs. Voluntary forms are still processed. How the Colorado wording applies to an SBR with no approved federal form is untested and Not yet verified.

We found no official answer. As covered in our suppressor guide, the gun-rights site COSSF reported on October 12 that there was no guidance from the Attorney General, the Colorado Bureau of Investigation or the courts. Firearms Policy Coalition included Colorado among 15 states it wrote to on October 9, asking attorneys general to stop enforcing registration-based laws, and we found no public answer. Our Colorado suppressor guide walks through the same gap, since silencers sit in the same subsection.

Hunting

SBR-specific hunting rules: Not yet verified. Per our suppressor guide, we found no Colorado Parks and Wildlife rule that bars suppressors.

Other laws that interact

Same list as silencers and machine guns. Section 18-12-102(1) puts the short rifle in one list with the firearm silencer, machine gun, machine gun conversion device and short shotgun.
Peace officers. Section 18-12-101(2) makes it an affirmative defense to any provision of the article that a peace officer committed the act in the lawful discharge of their duties.
Making a frame or receiver. Per our research notes, the general rule in 18-12-111.5(5)(a) bars anyone other than a federally licensed firearm manufacturer from manufacturing a frame or receiver of a firearm. We found no short-rifle-specific making rule.
Crime of violence sentencing. The Title 18 crime-of-violence provision adds five years, served consecutively, when the charge specifies use of a dangerous weapon as defined in 18-12-101 and 18-12-102.
SB25-003. Per our suppressor guide, it applies to purchases and transfers of specified semiautomatic firearms on or after August 1, 2026. It may reach a semi-auto rifle you plan to shorten.
State license requirement and CLEO sign-off: Not yet verified.

Braced pistols

The state statutes cited here don't mention pistol braces. See our pistol brace guide for the federal picture.

Federal process in 2026

The making and transfer tax on SBRs has been $0 since January 1, 2026.
ATF stopped Form 1 and Form 4 enforcement on October 9. Voluntary forms are still processed. See NFA wait times.
Dealers use a Form 4473 and NICS check. ATF won't enforce 18 U.S.C. 922(b)(4) "Until final rules are issued."
"For now," interstate transport still needs an approved Form 20 (18 U.S.C. 922(a)(4)).
A dealer can't sell where state law forbids it (18 U.S.C. 922(b)(2)).

ATF says there is no automatic grandfathering if enforcement resumes. Full detail is on our SBR rules 2026 page, and you can compare states with the state NFA checker.

Checked against the official statute text on October 28, 2026.

Frequently asked questions

Are short-barreled rifles legal in Colorado?

Colorado lists a short rifle as a dangerous weapon in C.R.S. 18-12-102, and knowing possession is a class 5 felony. Subsection (5) gives an affirmative defense to a person with a valid permit and license for possession.

How does Colorado define a short rifle?

C.R.S. 18-12-101(1)(h) defines a short rifle as a rifle having a barrel less than sixteen inches long or an overall length of less than twenty-six inches.

What is the penalty for an SBR in Colorado?

Knowingly possessing a dangerous weapon, which includes a short rifle, is a class 5 felony under C.R.S. 18-12-102(3).

Does Colorado require federal registration for an SBR?

The sections we read never mention federal registration. The defense in 18-12-102(5) is a valid permit and license for possession, which the statute does not define. How it applies after ATF's October 9, 2026 change is not yet verified, and we found no Attorney General guidance.

Do I need a Form 20 to bring an SBR into or out of Colorado?

According to ATF's fact sheet, "For now," transporting an SBR across state lines still requires an approved Form 20. State law at your destination also applies.

Are short-barreled rifles legal in Colorado? (2026)

The short answer

The statute

How Colorado defines an SBR

Penalty

Is legality tied to federal registration?

Hunting

Other laws that interact

Braced pistols

Federal process in 2026

Frequently asked questions

Sources

Keep exploring

Are short-barreled rifles legal in Colorado? (2026)

The short answer

The statute

How Colorado defines an SBR

Penalty

Is legality tied to federal registration?

Hunting

Other laws that interact

Braced pistols

Federal process in 2026

Frequently asked questions

Sources

Keep exploring

The Gun Release Report