Under the control of Desirée Atkins, Jonathan shot a bullet out of this gun but Clark incinerated it at super speed, saving Lex.
In a flashback, Hiram is armed with this gun when he meets Joe the Drifter, who's actually Jor-El. After getting a message from the future, Jonathan protects Lana at his farm with this gun. Adam Knight knocks him out and steals this gun and chases Lana outside with it, shoots it at Lana but Clark super speeds in the way and it bounces off. Clark must've recovered it because Jonathan's seen using it in an episode after it. Jonathan goes to the Kawatche caves with this gun and goes berserk, but Clark stops him before he could significantly hurt Lionel.
Stripped of his powers by magic, Clark confronts the three witches with this gun.