One of the less-discussed exceptions in SB25-003 is also one of the more actionable: a semiautomatic rifle or shotgun with a permanently fixed magazine that can't hold more than 15 rounds isn't a specified semiautomatic firearm — and the statute explicitly says a converted firearm qualifies too.
The actual text
C.R.S. 18-12-116(1)(d)(II)(C) excludes: "a firearm that has a permanently fixed magazine that cannot accept more than fifteen rounds of ammunition, including a semiautomatic firearm that has been converted to have a permanently fixed magazine that cannot accept more than fifteen rounds of ammunition."
That second clause matters. This isn't just describing rifles that were built from the factory with a fixed magazine — it's explicitly telling you that taking an otherwise-covered detachable-magazine rifle and converting it to a fixed, 15-round-or-fewer magazine takes it out of the SSF definition entirely.
The obvious question the statute doesn't answer
What does "permanently fixed" actually require? The statute doesn't define it, and we haven't found a court decision, agency Statement of Position, or declaratory order that spells out the technical threshold. In the broader gun-law world (California and other states with similar fixed-magazine schemes have grappled with this same question for years), "permanently fixed" is generally understood to mean the magazine can't be removed through normal manipulation — something like pinning, welding, epoxying, or otherwise altering the firearm so the magazine release no longer functions to detach it, as opposed to simply using a magazine that happens to hold 15 rounds while the release mechanism still works normally.
We want to be direct about the limits of what we actually know here: Colorado's statute doesn't specify a technical standard, and we're not aware of official state guidance that does either. If you're considering this route, "it looks permanent to me" isn't the same as a standard a prosecutor, a dealer, or a court would necessarily agree with.
Why this matters more than it might seem
For someone who already owns a detachable-magazine rifle and doesn't want to deal with the eligibility card and safety course process, converting to a compliant fixed magazine is the one option in the statute that lets you keep the same physical firearm and simply exit the SSF category going forward — no purchase, no transfer, no new background check required, since you're not manufacturing, distributing, transferring, selling, or purchasing anything by modifying a gun you already own.
Before you do it
Given the lack of a defined technical standard, this is a case where getting it wrong could matter — both to make sure the conversion is actually solid enough to hold up, and because reversing it later (if you ever wanted the detachable magazine back) would put the rifle right back into SSF territory for any future sale or transfer. Talk to a gunsmith experienced with fixed-magazine conversions in other states' magazine-restricted markets, and consider running the specific method past an attorney or the state's Statement of Position process if you want documented certainty.
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.
