How to buy a semi-auto in Colorado after August 1, 2026
Colorado's New Gun Law (SB25-003): What Changed & What to Buy
What SB25-003 Actually Does
Colorado's SB25-003 took effect on August 1, 2026. Despite years of "Colorado gun ban" headlines, the law that actually passed is not a ban — it's an eligibility-and-training requirement. To buy or transfer most semi-automatic firearms that accept a detachable magazine, you now have to complete a state-approved firearms safety course and obtain an eligibility card first.
The bill was introduced as a hard ban on the sale of detachable-magazine semi-autos, then amended during the 2025 session into the permit-and-training model that Governor Polis signed on April 10, 2025. Firearms you already lawfully own are not affected — the law does not restrict simply keeping or using them.
| Metric | Value |
|---|---|
| Safety Course | Required |
| Eligibility Card | New Step |
| Existing Guns | Grandfathered |
| Magazine Cap | 15 Rounds |
This guide is informational only and is not legal advice. Colorado's implementing rules are still being finalized, and the specifics of the course, the eligibility card, and the covered-firearm list can change. Verify current requirements with the Colorado Bureau of Investigation and your local FFL, and consult an attorney for your specific situation.
The New Purchase Process
Under the old rules, buying an AR-15 in Colorado meant a standard background check at an FFL. As of August 1, 2026, buying a covered semi-auto is a multi-step process:
- Take a state-approved safety course. Colorado authorizes a basic and an extended course covering safe handling, secure storage, and state law.
- Get your eligibility card. After the course, you apply through your county sheriff, who verifies eligibility and issues the card.
- Buy at an FFL. Present the card, pass the standard background check, and complete the purchase like normal.
Plan the timeline, not just the purchase. The course and the sheriff's eligibility step take time — this is no longer a same-day buy. If you expect to want a semi-auto rifle in the next year, start the course now so the card is in hand when you're ready. The firearm itself is the easy part.
What To Buy: Rifles Worth The Extra Step
Because the process now takes real effort, most Colorado buyers are consolidating around one quality rifle instead of several impulse buys. These are the platforms that reward the investment.
Premium Tier ($1,300–$2,000)
Buy-once rifles from the most-trusted names — the ones you keep for decades:
The Geissele Super Duty and Daniel Defense DDM4 V7 are the two most-recommended complete rifles in the AR-15 community — cold-hammer-forged barrels, properly staked gas keys, and mid-length gas for a smooth-shooting 16" gun.
Budget & Mid Tier ($500–$900)
Completely reliable rifles that leave budget for the course, ammo, and magazines:
The PSA Guardsman-15 stands out for shipping with mid-length gas — the spec experienced shooters recommend for a softer-shooting 16" rifle. The IWI Zion-15 is a step up in fit and finish that still lands under most premium rifles.
Don't Forget Magazines
Colorado has capped magazines at 15 rounds since 2013 — that part isn't new. What SB25-003 changed is the penalty: selling, transferring, or possessing a magazine over 15 rounds is now a class 1 misdemeanor. Standard 30-round AR magazines are not sold at retail in the state.
Stick to compliant magazines. In-state, that means 15-round (or smaller) magazines. Magpul and others make 10- and 15-round PMAGs specifically for capacity-limited states. Don't import 30-rounders — the penalty increase under SB25-003 is real and it isn't worth it.
Brands You'll Actually Find
The AR-15 brands with the deepest complete-rifle selection on GunPartPicker — a solid proxy for what's widely stocked, supported, and easy to find in stock:
Top AR-15 Rifle Brands by Catalog Share
Share of complete rifles among the top brands on GunPartPicker
| Item | Share (%) |
|---|---|
| CMMG | 33% |
| Daniel Defense | 18% |
| Palmetto State Armory | 14% |
| POF-USA | 12% |
| Smith & Wesson | 8% |
| Geissele | 7% |
| Ruger | 4% |
| Bravo Company | 3% |
Your Compliance Checklist
Everything to line up, in order:
| Metric | Value |
|---|---|
| Safety Course | #1 |
| Eligibility Card | #2 |
| Choose Your Rifle | #3 |
| 15-Round Mags | #4 |
What's Serialized — And What Isn't
Colorado's course-and-eligibility requirement attaches to the firearm, and on an AR-15 exactly one part is legally the firearm. Knowing which is which tells you precisely which purchases run through the new process and which you can still order straight to your door.
Goes through an FFL — the serialized firearm:
- Lower receiver (stripped or complete) — this is the serial-numbered part; legally, it is the rifle
- Any complete rifle — it's built on a serialized lower
Not serialized — ships to your door, no FFL:
- Upper receiver — stripped or complete, including the barrel, bolt carrier group, and handguard
- Barrels, bolt carrier groups, handguards
- Stocks, buffer tubes, triggers, gas blocks and gas tubes
- Muzzle devices, charging handles, grips
The takeaway: the expensive, performance-defining half of an AR-15 — the complete upper — is not serialized. You can order a premium upper online with no eligibility step and pair it with a single serialized lower you acquire through the new process. That's what makes the "quality upper + budget lower" route so efficient here.
If you're building, start with the serialized lower — this is the part that runs through the course-and-card process:
Then finish it with a complete upper — not serialized, so it ships to your door with the barrel, BCG, and handguard already installed:
Magazines aren't serialized either, but Colorado caps them at 15 rounds — a separate rule from the SB25-003 purchase process. And buying the serialized lower still runs through an FFL, so there's no parts-kit workaround for the one regulated component. Because the covered-firearm definition and the course rules are still being finalized, confirm with your FFL whether a specific purchase triggers the eligibility-card step.
The Bottom Line
Colorado did not ban the AR-15. It made buying one a deliberate process: take the course, get your eligibility card, then buy at an FFL like normal. The practical takeaway is to buy quality once — get the training done, pick a rifle you'll keep, and stock compliant 15-round magazines. What you already own is grandfathered and stays yours.
Frequently Asked Questions
GPP Editorial Team
AR Build Specialists
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