The receiver is the frame of a firearm- in modern firearms, it is the part that the barrel connects to. Antique firearms, such as muzzle loading rifles, did not have a receiver- only the lock, stock, and barrel. (Yes, that is where the expression came from)
On a modern firearm, if it has a serial number, it is stamped on the receiver. By US law, a receiver IS a firearm- everything else is parts.
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