Q. What is required when I bring firearms from another state?

A. There are no restrictions on bringing lawfully owned firearms into Colorado.    However certain ammunition magazines are prohibited, even if the firearm they fit is legal here.    The statute exempts otherwise prohibited magazines that were owned as of July 1, 2013 by their current owner.    The statute does not require that the magazine had to be owned by its current owner within Colorado on July 1, 2013; the owner could have resided outside the state at that time.    Generally speaking magazines that hold over 15 rounds of rifle or pistol ammunition are prohibited, as are shotgun magazines that hold over 8 rounds.

The prohibited magazines are defined as :”(I) A fixed or detachable magazine, box, drum, feed strip, or similar device capable of accepting, or that is designed to be readily converted to accept, more than fifteen rounds of ammunition;  (II) A fixed, tubular shotgun magazine that holds more than twenty-eight inches of shotgun shells, including any extension device that is attached to the magazine and holds additional shotgun shells; or (III) A nontubular, detachable magazine, box, drum, feed strip, or similar device that is capable of accepting more than eight shotgun shells when combined with a fixed magazine.”
Specifically excluded from the definition are :”(I) A feeding device that has been permanently altered so that it cannot accommodate more than fifteen rounds of ammunition; (II) An attached tubular device designed to accept, and capable of operating only with, .22 caliber rimfire ammunition; or (III) A tubular magazine that is contained in a lever-action firearm.”

CRS section 18-12-302. Large-capacity magazines prohibited - penalties - exceptions
(1) (a) Except as otherwise provided in this section, on and after July 1, 2013, a person who sells, transfers, or possesses a large-capacity magazine commits a class 2 misdemeanor.
(b) Any person who violates subsection (1) of this section after having been convicted of a prior violation of said subsection (1) commits a class 1 misdemeanor.
(c) Any person who violates this subsection (1) commits a class 6 felony if the person possessed a large-capacity magazine during the commission of a felony or any crime of violence, as defined in
section 18-1.3-406.
(2) (a) A person may possess a large-capacity magazine if he or she:
(I) Owns the large-capacity magazine on July 1, 2013; and
(II) Maintains continuous possession of the large-capacity magazine.
(b) If a person who is alleged to have violated subsection (1) of this section asserts that he or she is permitted to legally possess a large-capacity magazine pursuant to paragraph (a) of this subsection (2), the prosecution has the burden of proof to refute the assertion.
(3) The offense described in subsection (1) of this section shall not apply to:
(a) An entity, or any employee thereof engaged in his or her employment duties, that manufactures large-capacity magazines within Colorado exclusively for transfer to, or any licensed gun dealer, as defined in
section 12-26.1-106 (6), C.R.S., or any employee thereof engaged in his or her official employment duties, that sells large-capacity magazines exclusively to:
(I) A branch of the armed forces of the United States;
(II) A department, agency, or political subdivision of the state of Colorado, or of any other state, or of the United States government;
(III) A firearms retailer for the purpose of firearms sales conducted outside the state;
(IV) A foreign national government that has been approved for such transfers by the United States government; or
(V) An out-of-state transferee who may legally possess a large-capacity magazine; or
(b) An employee of any of the following agencies who bears a firearm in the course of his or her official duties:
(I) A branch of the armed forces of the United States; or
(II) A department, agency, or political subdivision of the state of Colorado, or of any other state, or of the United States government; or
(c) A person who possesses the magazine for the sole purpose of transporting the magazine to an out-of-state entity on behalf of a manufacturer of large-capacity magazines within Colorado.

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