The SDK (Schalldämpfer Karabiner, "Silenced Carbine") is an integrally suppressed bolt-action pistol-caliber carbine similar to the De Lisle Carbine, alleged to be of WWII-era German origin. Little reliable information on the weapon exists, and most information, including the given name, comes from the claims of James P. Atwood, an Axis memorabilia collector who claimed to have obtained a model marked No. 2 in the late 1960s. Atwood claimed that the rifle was commissioned by the chief of Berlin police, Wolf-Heinrich von Helldorff, for use by the Gestapo, and used special unmarked 9×19mm rounds with soft-nosed tips laced in cyanide.
While Atwood's claims were reproduced in several 1970s magazine articles, Atwood was more notoriously a fraudster who created counterfeit Nazi German daggers and sold them for profit. The SDK, the "Adolf Hitler assassination rifle," was believed to be the creation of another one of Atwood's fraud schemes and created post-war. A. D. Royster Militaria stated that the rifle was built to order by a Berlin gunsmith for Atwood. Atwood made two rifles, sold one to the CIA (Atwood was a CIA contract worker stationed in Berlin), then hyped up the other one as a prototype weapon with historical significance (given Helldorf's involvement in the 20 July plot) to sell it for massive profits to an unsuspecting collector.
The SDK appears to be a bullpup design, with the bolt, breech, and magazine feed located in the stock of the weapon. The front of the barrel was encased in a large integral suppressor. The SDK used a scope and had a twin-trigger arrangement (the second trigger being most likely a "stabilizing trigger" that makes the main trigger pull lighter when pulled). The gun used Luger magazines.
The Schälldampfer Karabiner and variants can be seen in the following films, television series, video games, and anime used by the following actors:
|Game Title||Appears as||Mods||Notation||Release Date|
|Call of Duty: WWII||"SDK 9mm"||Various optional attachments||Released in Halloween Scream update in 2018||2017|