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As long as you're meeting any restrictions for your state (see: https://www.budsgunshop.com/catalog/state_restrictions.php), and it is not prohibited in your state, upper receivers can be shipped directly to you.

According to most state laws the only the lower part is required to have to be serial numbered and registered.

I've never heard of a issue buying a upper or any other parts without using a FFL except the Lower.