2013

Signed | 2013-03-20

HB13-1224: 15-round magazine limit signed

Colorado enacted a statewide restriction on magazines capable of holding more than 15 rounds, with a grandfather clause for continuously possessed magazines.

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2013

Effective | 2013-07-01

Magazine-capacity limit takes effect

The 15-round magazine restriction became enforceable under Colorado law.

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2013

Effective | 2013-07-01

Universal background checks expand

Colorado expanded background-check requirements to most private firearm transfers.

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2019

Signed | 2019-04-12

HB19-1177: Red flag orders signed

Colorado created extreme risk protection orders allowing courts to order firearm surrender under defined petition procedures.

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2020

Effective | 2020-01-01

Red flag law takes effect

The ERPO process became available statewide, making it a live enforcement tool.

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2020

Court | 2020-06-29

Colorado Supreme Court upholds magazine limit

The state supreme court upheld Colorado's large-capacity magazine law against a state constitutional challenge.

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2023

Signed | 2023-04-28

HB23-1219: Three-day waiting period signed

Colorado approved a mandatory waiting period before delivery of most purchased firearms.

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2023

Signed | 2023-04-28

SB23-169: Purchase age raised to 21

Colorado raised the legal age to purchase firearms to 21, with limited exceptions.

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2023

Signed | 2023-06-02

SB23-279: Unserialized firearm restrictions signed

Colorado restricted unserialized firearms, frames, receivers, and certain unfinished components.

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2023

Effective | 2023-10-01

Three-day waiting period takes effect

The waiting-period law became effective for most firearm transfers covered by the act.

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2024

Effective | 2024-01-01

Unserialized firearm restrictions take effect

Possession, transfer, and manufacture rules for unserialized firearms and unfinished frames/receivers became enforceable.

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2026

Effective | 2026-08-01

SB25-003: Semiautomatic firearm purchase-card regime

Colorado's new requirements for specified semiautomatic firearm purchases are scheduled to take effect.

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1934

Federal | 1934-06-26

National Firearms Act restricts machine guns, SBRs, SBSs, and suppressors

Congress imposed registration and taxation requirements on categories including machine guns, short-barreled rifles, short-barreled shotguns, and suppressors.

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1968

Federal | 1968-10-22

Gun Control Act expands federal firearm controls

The federal government broadened licensing, prohibited-person, interstate-transfer, and import restrictions.

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1986

Federal | 1986-05-19

Hughes Amendment closes new civilian machine-gun registry

The Firearm Owners' Protection Act included a machine-gun transfer restriction for firearms not already registered before the cutoff.

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1993

Federal | 1993-11-30

Brady Act adds federal background-check system

The Brady law created the path to federal background checks through the National Instant Criminal Background Check System.

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1994

Federal | 1994-09-13

Federal assault-weapons ban enacted

Congress restricted listed semiautomatic firearms and magazines over 10 rounds until the ban expired in 2004.

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