The part of the gun that has a serial number is the lower receiver that has been stripped. When you buy the lower receiver, it works the same way as when you buy a finished gun. AR-15 lower receivers that have been stripped must be sent to an FFL dealer. Before you can get a stripped lower, you will have to pass a background check by the federal government. To put together the AR-15 stripped lower, you will need 31 different parts, such as the trigger, bolt catch, springs, pivot and takedown pins, selector switch, and hammer.
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