(17) "Short barrel", a barrel length of less than sixteen inches for a rifle and eighteen inches for a shotgun, both measured from the face of the bolt or standing breech, or an overall rifle or shotgun length of less than twenty-six inches;
The ATF has issued letters saying that the minimum can be met with the stock fully extended. I don't know if MO has issued an opinion.
Few 16" guns will be less than 26" with the stock folded. If your barrel is less than 16" and you have an NFA item, the minimum obviously doesn't apply.
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