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If you take a bolt out of your firearm, it is no longer capable of discharging ammunition, but is it now a frame/receiver only? No. IMHO as long as you own an upper and a complete lower, it should be registered as a complete firearm. Disassembling a firearm is not the same as making it incapable of discharging ammunition.
So... What if you only own a fully functioning lower? Or, one upper and three lowers? Why would the CFC register functional lowers like this of what you say is true?
Yeah, I am playing devils advocate, and in particular I am not suggesting anyone do or not do anything, but I am pointing out how flawed the laws are in this area.