re: What do I need to know about Ar Lowers purchases then Completing the gun?

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Any paperwork needed to match a lower to an upper?

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Not unless you are using a barrel shorter than 16", which would then make it an NFA stamp issue.

Think of it as the stripped lower receiver being the only thing considered a "firearm". Everything else is an accessory. I can see how it seems strange, but adding a new stock or grip is not anything you'd ever expect to need a background check for. Same goes for a new barrel (16" or over), bolt, upper receiver, etc.. They are just parts to upgrade or add and no paperwork or background check is required. Can all be bought online and delivered to your door. Don't even need to sign for it.