Best known is the Volkssturmgewehr by Gustloff which was however a gas-delayed blowback semi-automatic rifle.
He is one of the more prominent characters in the Günter Grass' novel Crabwalk (2002), which describes in detail the sinking of the Wilhelm Gustloff.
Frankfurter's assassination of Gustloff is the subject of the 1975 Swiss movie Assassination in Davos which gives a good account of the events with much of the film devoted to the subsequent trial.
Wilhelm Gustloff (January 30, 1895 - February 4, 1936) was the founder of the Swiss NSDAP/AO (the Nazi party organization for German citizens abroad) at Davos.
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Crabwalk the assassination of Gustloff is an element of the plot of this 2002 novel, even though its main subject is the sinking of passenger-ship named in his memory.