Regarding your finding an exemption in the GCA of 1934, I'm thinking that they mean an original design 8" artillery barrel, not a 12" barrel with an artillery style rear sight. My moto is to always stay safely inside of the gun control laws and avoid walking near that fine line...
But there is a special division within the BATF that you could contact in writing and request a ruling. Just avoid possessing an artillery stock until the matter is resolved (unless you also own a correct 8" artillery model Luger too.)
dju
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