Given how much national controversy pistol braces have generated over the past several years, it's a reasonable assumption that they'd get special treatment in Colorado's new law. They don't — because the bill never mentions them at all.
The word "brace" doesn't appear in SB25-003
Read the actual definition in 18-12-116(1)(d): a specified semiautomatic firearm is a semiautomatic rifle or shotgun with a detachable magazine, or a gas-operated semiautomatic handgun with a detachable magazine. Nothing about stabilizing braces, arm braces, or overall length. The presence or absence of a brace simply isn't one of the variables the statute checks.
What actually determines SSF status for a braced pistol
The same three questions as any other handgun: is it a semiautomatic handgun, is it gas-operated rather than recoil-operated, and does it have a detachable magazine. A braced AR-pattern or AK-pattern pistol is caught by the SSF definition because it's a gas-operated handgun with a detachable mag — the exact same reason an identical, unbraced version of that same pistol would be caught. Strapping on or removing a brace doesn't change the operating system or the magazine, so it doesn't change the SSF analysis either way.
Don't confuse this with the separate federal brace saga
Pistol braces have their own federal history, and it's now fairly well resolved: the ATF's 2023 rule attempting to reclassify braced pistols as short-barreled rifles was struck down nationwide in federal court (including in Mock v. Bondi out of the Fifth Circuit and Johnson v. ATF out of the Eighth Circuit), the Department of Justice dropped its appeals in July 2025, and ATF confirmed the rule's demise in a February 2025 Federal Register notice. As of 2026, braced pistols are treated as ordinary handguns at the federal level — no NFA registration required on account of the brace. That's a completely separate legal question, governed by federal law (the National Firearms Act) and litigated in federal court, from whether a gun is a "specified semiautomatic firearm" under Colorado's state law. A pistol can be entirely fine under current federal brace rules and still be a state-level SSF, or vice versa in theory — the two frameworks just don't talk to each other. (A few other states — California, Connecticut, New York, New Jersey, Washington, and Illinois among them — have their own separate brace restrictions; that's a state-by-state question unrelated to Colorado's SSF law.)
Bottom line
If you're trying to figure out whether your braced pistol is an SSF, ignore the brace entirely and ask the same gas-vs-recoil question covered in our companion post, Why Your Glock Is Fine But Your AR-15 Pistol Isn't.
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.