Innerspace

The following guns are used in the movie Innerspace

Unknown machine pistol

Several of the men who raid Vectorscope Labs are armed with small machine pistols. They never fire them - they instead spray the scientists with knockout gas, making the presence of the guns somewhat pointless.

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The robber at the bottom of the picture has a machine pistol.

Unknown automatic

Victor Scrimshaw's blond henchman (Jason Laskay) has a black automatic pistol with a brown (wood?) grip in a shoulder holster. Lydia Maxwell (Meg Ryan) steals it from him after knocking him out. Apparently, the henchman fired it several times prior as the weapon runs empty after being fired only twice (once in the air to get the villains' attention, and a second time accidentally while gesturing with the weapon).

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Lydia, on the phone with her reporter friend, checks the gun after taking it from the henchman.

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Lydia points the henchman's gun at the villains.

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Reverse-angle with the gun held on Scrimshaw (Kevin McCarthy).

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Lydia and Jack encounter another henchman on the stairs, who she holds the gun on. He bets it isn't loaded, to which Lydia replies, "Oh yeah?" and fires it at the ceiling.

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The gun clicks emptily, to her and Jack's mutual distress.

Prosthetic hand

Assassin Mr. Igoe (Vernon Wells) is missing his right hand, and so has it replaced with a high-tech prosthesis system that lets him swap out his ordinary cosmetic hand for a variety of different weapons (a blowtorch, a drill, etc.). One of these is a silenced gun disguised as a gloved cosmetic hand with a pointing index finger. The pointing finger is the gun barrel. This is a entirely fictional weapon and the "gunshot" it produces merely a muted squib.

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The "gun hand" at Igoe's side.

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Igoe raises his arm and takes aim at scientist Ozzie Wexler.

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Igoe fires, fatally wounding Ozzie.

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Igoe shows off to a frightened little boy who witnessed the shooting, blowing the smoke of the tip of the finger/gun barrel.

Taser gun

Lydia at one point pulls a taser gun on Igoe when he attempts to kidnap Jack Putter (Martin Short). She claims it shoots up to "20,000 volts."