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.
A couple of these are actually the similar Taurus PT92s; in the picture directly below this, the one in Lex's left hand is a PT92, while the one in his right is a Beretta 92FS Inox.
Gabriel Duncan uses a Beretta 92FS to kill the guards in the missile silo, and to shoot and kill Clark. Clark was later shot with it by Chloe Sullivan. It appears to be a non-gun, as it doesn't cycle when it fires.
A Smith & Wesson Model 610 is a prop gun used in the episode as a prop gun for a movie made. It was decorated as a villain weapon. Season 7, episode 5 "Action". This is most likely the same revolver that we saw Blade used briefly in Blade Trinity.
What appears to be a Heckler & Koch G36C with a modified scope and laser sight is used in the season three episode "Extinction" by the character Van McNulty as played by Jesse Metcalfe.
The Glock 17 is used by police officers and other characters in the series. Also the Glock featured is a second generation Glock, giveaways being the finger grooves and tactical rail are absent.