Species

The firearms seen in the 1995 science fiction/horror film Species include the following...

Glock 17

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A Generation 2 Glock 17 in 9x19mm. This model added finger stepping and cuts to the backstrap of the frame to make it easier to hold than the Generation 1 model.

Michael Madsen's sidearm in the film was a Glock 19, not a 17. Not that anyone would know who used it since this page has no descriptions or screencaps... - Gunmaster45

Beretta 92FS

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Beretta 92FS - 9x19mm.

M16A2

US Army soldiers at the Dugway Base in Utah were armed with M16A2 rifles.

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M16A2 5.56x45mm

IMI Uzi

Special Forces soldiers were seen armed with IMI Uzi submachine guns throughout the film.

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IMI Uzi 9x19mm

Cobray CM79LF 37mm Launcher

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Cobray M79LF stand alone launcher (other side) - 37mm)