1917 DWM Luger, Artillery style xx62e

[Edward Tinker]

and then this....

M24) If a person has a pistol and an attachable shoulder stock, does
this constitute possession of an NFA firearm?
Yes, unless the barrel of the pistol is at least 16 inches in length (and the
overall length of the firearm with stock attached is at least 26 inches). However,
certain stocked handguns, such as original semiautomatic Mauser
"Broomhandles" and Lugers, have been removed from the purview of the
NFA as collectors' items.
[26 U.S.C. 5845, 27 CFR 479.11]