Maniac

Maniac is a 1980 cult horror slasher/splatter directed by William Lustig and is notable for character actor Joe Spinell's portrayal of a psychotic serial killer Frank Zito as well as incredible special make-up effects by genre cult guru Tom Savini and neo-noir dark romantic depiction of New York.

Maniac (1980)

The following weapons were used in the movie Maniac:

12 Gauge Double barreled shotgun

Frank Zito (Joe Spinell) uses a 12 Gauge double barreled shotgun in the most famous scene of the movie, where he shoots disco boy (special effect makeup artist Tom Savini) and disco girl (Hyla Marrow) with it in their car. Zito uses a violin case to illegally hide his weapon, when he's in the city.

Zito's table. Shotgun is on the left, waiting to be put in the violin case.Also note the stiletto, bayonet, and machete.

Zito putting shotgun in the violin case.

Shotgun in the violin case.

Zito aims his shotgun at disco boy (Tom Savini).

Zito aims his shotgun at disco boy. Note that disco boy is a special effects dummy (though really well made). The hands are those of Tom Savini making it so he's shooting himself in this scene.

Zito shooting disco boy. Note absence of big muzzle flash and that barrels are moving strangely.

Zito points his shotgun at disco girl (Hyla Marrow).

Close up of shotguns barrel from disco girls point of view.

Shotgun among with pistol case and violin case on the table near the end of the movie.

Shotgun on the table.

Unknown sports or air pistol

Frank Zito uses an unknown pistol held in special case, while practising shooting in his apartment. He doesn't fire this pistol in the movie, but there are bullet holes in the wall, presumably by bullets fired from this pistol.

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Zito with his pistol case.

Zito taking the pistol from the case.

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Zito aims his pistol at the wall.

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Colt Detective Special

Two police detectives (Randy Jurgensen and Jimmy Aurichio), that arrive in Zito's apartment in the movie's final scene use Colt Detective Special revolvers.