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On length, there's the barrel length minimum that everybody knows about (16") but there's also a minimum overall length - 26" I think? Damn, or is it 28? Whatever - find out, and meet it.
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That's not really much an issue on the AR-15 platform. If you are keeping the gun in the non-NFA territory, you have a 16" barrel. Then add in the length of the upper receiver and the buffer tube (even a shorter one for a collapsible stock) and you're still over the minimum 26" length. I forget exactly how long the upper is; it's at least six or seven inches. There's no such thing as a buffer tube shorter than four inches. For non-NFA ARs, you're automatically past the 26" minimum.