16" barrel minimum and 26" OAL minimum is what I just read at the ATF website. I just measured a 4.40 Short action, and near as I can figure it, from the back of the tang on the action to get the 26" OAL you would need an 18 1/2" barrel, but the stock itself will add at least 1" if not more, so depending on the stock you get, it is entirely possible to use a 16" barrel. If you build using a Long Action you gain between 1" and 1.25" assumming all else is the same.
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