The following weapons were used in the anime series 91 Days:
Nice, but where's the trigger?
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Avilio wields an M1911A1 pistol, given by Vanno.
Remington 1866 Derringer
Fango uses a Gold-plated Remington 1866 Derringer in Ep. 02 "Phantom of Falsehood".
Smith & Wesson Model 10
Smith & Wesson Model 10 can be seen.
Colt Single Action Army
A Single Action Army is used by Fango.
Thompson Submachine Gun
Like most crime dramas set in the Prohibition times Thompson Submachine Gun appears in these anime.
Winchester Model 1892
In Ep. 04 "Losing to Win, and What Comes After", a farmer is seen using a Winchester Model 1892 rifle.