As you may know, the C96 with an original German-made shoulder stock has been removed from the purview of the NFA and is considered a Curio and Relic, though still a pistol and subject to the FFA. Pistols with reproduction stocks are still under the NFA. Check state and local laws, also. A few states copied the federal law and have not changed.
GUNNER336 said:Replica stocks of the originals are exempt ATF has ruled. But you cannot attached a stock to a Colt 45 or Glock . Go figure
Mauser, Model 1896 semiautomatic pistol accompanied by original German mfd. detachable wooden holster/shoulder stocks, all semiautomatic German mfd. variations produced prior to 1940,
any caliber.
Mauser, Pistol-Carbine, model 1896, 7.63mm, with shoulder stock and 11-3/4" to 16" barrel.
Replica stocks of the originals are exempt ATF has ruled.
Because no rational reason to restrict a shoulder stock is coming to mind.