I missed out on buying a original Luger stock by being out bidded. Then I did some research when I got home and found out that if you put a stock on a "regular" Luger, you then have a SBR or short barrelled rifle. ATF really,really frowns on that!!!

It appears that you put an original or reproduction stock on a on a artillery luger, you should be ok. However, do not let my reading of the law be cast in stone.
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