On July 1, 2026, the Firearms Dealer Division (FDD) — the part of the Colorado Department of Revenue tasked with implementing SB25-003 — published its official guidance on which specific firearm models it considers "specified semiautomatic firearms" (SSFs). It's a long document: roughly 900 makes and models, split into semiautomatic rifles with detachable magazines, semiautomatic shotguns with detachable magazines, and gas-operated semiautomatic handguns with detachable magazines.

If you own an AR-15, here's how to actually use it.

How the list is organized

Entries are grouped by manufacturer, then by product line or series name — "AERO PRECISION - M4E1 PRO SERIES," "ANDERSON MANUFACTURING - AM-15 SERIES," and so on — rather than by individual SKU. In practice, that means most standard AR-platform rifles get swept in under a manufacturer's general series name rather than needing an exact model-number match. Photos next to each entry are explicitly labeled as examples only, and the document says they "do not represent all variations of the rifles, shotguns, or handguns included within the same series."

Checking your rifle

Look up your manufacturer first, then see whether your rifle's product line appears under it. If you built your own rifle from parts, or bought from a smaller or newer manufacturer, don't be surprised if there's no exact match — that's addressed in the next section, because it matters more than it might seem.

The big caveat

The guidance document itself says it "does not constitute final agency action" and "is not all-inclusive... of firearms currently available, or that will be available in the future." That's a meaningful disclaimer, not boilerplate — it means the list is a compliance aid, not the actual legal boundary. We go into what that means in practice in our companion post, The List Isn't the Law.

If you have questions about a specific firearm, the FDD's contact is dor_fdd@state.co.us.

As always, we are not lawyers — just Colorado citizens trying to understand the new law and share what we learn. The information on this website is for general informational purposes only and does not constitute legal advice, nor does it create an attorney/client relationship. The accuracy, completeness, or currency of the content is not warranted. Your use of content on this website is at your own risk. Consult an attorney about your specific circumstances.