The C&R exemption list specifically states that the combinations listed are NOT NFA SBRs, but come under the GCA. That is what makes it OK to have historically correct combinations of Lugers and appropriate stocks (original or reproduction).
When you have the correct combination, it is not a NFA firearm and doesn't require the registration, tax and transfer that a NFA firearm would...
This means you can have a Navy stock with a Navy Luger; an Artillery stock with an artillery Luger, and many other listed combinations.
A Navy stock with an Artillery Luger would be a NFA firearm.
NFA firearms include full auto and other "sensitive" type firearms. Not just machine guns get covered under those rules.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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