You will note section III of the ATF Curio and relics table list those firearms as "Exempt from the National Firearms Act"
"Constructive possession" is a very tenuous legal theory' but you harass the ATF at your own risk. If you have a navy pistol, you can have a navy stock, if you have one of those strange Pacific Arms carbines with a detachable stock you have to decide if you can show it is the original stock.
If you have a Mauser P08 and want to have an artillery stock just for fun, you are on very thin ice. You might also note that the Mauser 1970's production Luger carbine is not exempted in section III but specifically noted as requiring a permit in section V.
If you want to expound on the law, cite cases that actually happened. There were two arrest cases in Florida in the past, a person selling an HK SP59 with a handguard and shoulder stock. Clearly NOT and exempted weapon and a person you-tubing himself shooting a Mauser S42 with an artillery stock, also not exempt. I am not sure of the final disposition of either case but BOTH were clearly not under the exemption.
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