so now I have AR parts and a useless 500 dollar upper, what should i do?
I believe stripped lowers are classified as "other" as opposed to pistol or rifle. You have to be 21 to buy an "other."
You might try buying a complete lower with a stock on it. That may take it out of "other" realm and make it a rifle. I have seen one ATF letter however stating that a lower that has never had an upper on it but has a stock could have the stock removed and be built into a pistol because a stocked AR receiver is not a rifle as defined by federal law, so that may not work either.
In theory you could take your upper in and attach it to a lower with a stock and that would make it a rifle. I don't know that you are going to get a shop to go for that. It just goes to show how nonsensical a lot of gun laws are.
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