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Legally, yes. A firearm is defined as the receiver (frame) Even when it has been taken apart, the receiver is still legally a firearm.
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.
An upper receiver is the top part of a firearm that houses the barrel, bolt carrier group, and other key components. It is typically attached to the lower receiver to complete the firearm.
The water table is the part of the receiver that the barrels of a double barrel or single shot break-action shotgun rest on.
Design of the firearm
Try the left side of the receiver as you hold the firearm- opposite the bolt.
The identity of a firearm is carried with action or receiver, the assembly containing the fire control assemblies, the part that is stamped with the primary serial number. Barrels are not controlled parts as they serve no purpose without a receiver.
The receiver of an action is typically called the "object" in a sentence. It is the noun or pronoun that receives the action of the verb.
A grooved receiver is a part of a firearm where the scope mounts are attached. It has grooves or rails that allow for the mounting of a scope or other optical sighting device onto the firearm for improved accuracy and precision in shooting.
Two basic styles of firearm actions are single action and double action.
Half barrel is not a type of firearm action.
In grammar, a doer is the subject of a sentence that performs the action, while the receiver is the object that receives the action. For example, in the sentence "John (doer) gives (action) the book (receiver) to Mary", John is the doer and the book is the receiver.