Action stars always resort to throwing their gun at their foe when out of ammo. People with combat training, have you ever heard of this being a taught tactic?

!Minimum of training mind! Not heard of that though the general rule of my preferred martial art is whatever works if they are out of cqc range and vicious yet controlled attacks so I’d imagine it’d be a possible feint or distraction rather than finishing move but I could imagine it being the practical option in certain circumstances.