Colorado SB25-003 LawsuitWhere the case stands in 2026

Gun owners around Franktown and Douglas County have spent the better part of a year watching one piece of legislation more closely than any other: Senate Bill 25-003. The law is scheduled to take effect on August 1, 2026, and it changes how many semiautomatic firearms are purchased in Colorado. It has also drawn a federal Colorado SB25-003 lawsuit that could shape whether those rules ever take hold the way they are currently written.

For anyone planning a purchase, training, or just trying to understand what is legal, the next several months matter. Here is a straightforward look at what the law does, who is challenging it, and where things stand right now, without the spin you will find on either side of the debate.

SB25-003 was signed by Governor Jared Polis in April 2025. In its final form, it does not flatly ban the firearms it covers. Instead, it creates a permit-to-purchase framework for what the law calls specified semiautomatic firearms, which broadly include semiautomatic rifles, shotguns, and gas-operated handguns that accept a detachable magazine.

Beginning August 1, 2026, buyers of those firearms will need to complete an approved safety course before they can purchase. The standard course runs 12 hours, though people who already hold a valid concealed carry permit or a recent hunter safety certificate can satisfy the requirement with a shorter four-hour course. The training includes a written exam.

The law carves out several exceptions. It does not affect firearms Coloradans already own, and it includes exemptions for military, law enforcement, corrections officers, and certain armored-vehicle businesses. One portion took effect immediately upon signing rather than waiting for 2026: a ban on rapid-fire conversion devices such as bump stocks and certain binary triggers. Understanding which parts are already active and which are still pending is the single most common point of confusion we hear about at the counter.

The main legal challenge is a federal case called Del Toro v. Polis, filed in Colorado federal court by the Mountain States Legal Foundation on behalf of the Colorado State Shooting Association, which is the state’s official NRA affiliate, along with several individual plaintiffs.

The named defendants include Governor Polis, Attorney General Phil Weiser, and a district attorney sued in his official capacity. The Colorado SB25-003 lawsuit asks the court to declare the permit-to-purchase requirement unconstitutional and to strike it down before it takes effect.

The plaintiffs argue that the permit and training requirements place an unconstitutional barrier between law-abiding citizens and firearms protected under the Second Amendment, and that delays, fees, and a limited pool of approved instructors could effectively block purchases for long stretches.

Supporters of the law see it differently. The bill’s lead sponsor, Senator Tom Sullivan of Centennial, has said publicly that he is confident the measure will hold up in court, and backers argue the training requirement is a reasonable step intended to reduce harm in mass-casualty events. Both descriptions are advocacy positions, and a court, not a press release, will ultimately decide which reading prevails.

As of the most recent updates, nothing has been struck down or blocked. Whether that date holds is the central question the Colorado SB25-003 lawsuit puts in front of the court. SB25-003 remains scheduled to take effect on August 1, 2026, while the lawsuits challenging the permit, training, and certification requirements continue to move through the courts. That is an important distinction: a lawsuit being filed is not the same as a law being paused. Unless a court issues a ruling that halts implementation, the August 1 date stands.

This is the right moment for a reminder that this article is informational only. Court dates move, guidance gets revised, and the practical answer to “what do I need to do” can change between when this is written and when you read it. Confirm the current status with a qualified attorney or the official state sources before acting on any plan tied to this law.

Alongside the litigation, a separate development has generated almost as many questions: the Colorado Department of Revenue released a draft guidance document identifying which firearms fall under the law. Reports indicate the draft lists roughly 900 makes and models, along with frames, receivers, and parts kits the state intends to regulate. Because the document is a draft, it can change before it is finalized, and the breadth of the list is one reason additional legal action may follow depending on how the final version reads. For owners, the takeaway is simple: if you are unsure whether a specific firearm is covered, check the official guidance rather than relying on secondhand summaries.

For our neighbors in Franktown, Parker, Castle Rock, Elizabeth, and the south metro, the practical picture is steady for now. Nothing about owning, shooting, or training with the firearms you already have has changed because of the lawsuit. Live-fire range time is unaffected, and the airsoft Shoot House operates independently of any of this. What is changing is the purchase process for covered firearms starting August 1, 2026, assuming the law takes effect as written. If you have been considering a covered firearm or want the required training squared away early, planning ahead beats scrambling near the deadline, when course availability across the state is likely to tighten.

The most useful thing you can do is separate what is settled from what is still moving. Settled: the bump stock and rapid-fire device provisions are already in effect. Still moving: the permit-to-purchase scheme, the final firearm list, and the outcome of the Colorado SB25-003 lawsuit. A sensible approach is to confirm whether any firearm you are eyeing appears on the state’s guidance, decide whether to complete qualifying training before demand spikes, and keep your documentation organized. If you already hold a concealed carry permit, you may qualify for the shorter training pathway, which is worth verifying now rather than later.

One last reminder, and this one matters most: nothing in this post is legal advice. SB25-003 is being actively litigated and the implementing rules are still being finalized by state agencies. For your specific situation, consult the current Colorado statute, official state guidance, or a licensed attorney before making any decisions.