John,
I agree for the most part with what you stated. However, I think that unspellable has the right idea and it is the frame that is the controlled part. If a complete receiver could be placed on the frame and be capable of firing a cartridge, that is what would constitute a firearm and require a FFL to transfer. You cannot buy a frame without a FFL.
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If it's made after 1918...it's a reproduction
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