MSP has stated that mags sold with a firearm must permanently restricted to 10 rounds. Dowel rod won’t do that. They put out an advisory to FFLs I believe
They are quite fond of pulling stuff out of their ass
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MSP can advise whatever they want. They don't make law though. In general FFLs comply with advisories even if it isn't the law, because they don't need or want MSP breathing down their neck.