Smallville

COP 357 Derringer

Seen used by Lex

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Beretta M92F

Also seen in use by Lex, also seen switched hands and used by Lana once to shoot open Lex's suitcase. Security, cops, and guards also seen in use. In season 7, Lex was seen duel wielding these. In fact, this is the most commonly seen weapon in the entire series, usually in the hands of Lex. In season 4 we see a suppressed one, also taken by Lex from his wouldbe assassin.

File:LexM92F.jpg File:LexM92F2.jpg File:LexM92F3.jpg File:LexM92F4.jpg

Unknown handgun

Seen used by an evil Lex

Unknown Revolver

A prop gun used in the episode as a prop gun for a movie made. It was decorated as a villian weapon.

Unknown SMG

Seen used by thugs in clown masks in a bank robbery

G36C

What appears to be a G36C with a large scope

Unknown Rifle

Seen in Season 5, episode titled Fanatic by some stalker, psyco girl and then made Lois use it.

Bow and Arrow

I know this doesn't count as a firearm, but should be noted since it is seen a lot and used by the Green Arrow.