The guns with unlimited ammo always trip me out. I'd love to have one of those.
A situation close to the original post happens in one of my favorite movies, though.
In John Carpenter's 1982 remake of "The Thing", a revolver of some type gets passed back and forth between the characters over the course of the film. Kurt Russel's character, MacReady, ends up with it. In scene involving a confrontation with several of the characters, Keith David's character, Childs, says, "He (referring to MacReady) ain't tying me up."
"Then I'll have to kill you Childs," says MacReady.
Childs responds, "Then kill me."
MacReady first points the gun at Childs at very close range and says, "I mean it." When Childs doesn't immediately back down, MacReady cocks the hammer on the revolver. After a few seconds, Childs swallows meaningfully and says, "I guess you do."
Immediately following this, Richard Masur's character, Clark, tries to rush MacReady from a different angle with a scalpel, and gets the shot to the forehead. Another lesson on why you shouldn't bring a knife to a gun fight.
I've never been able to tell what kind of revolver it is. Something like a S&W or a Colt, .357 or up. There's also a G3 type rifle wielded by a strung out Norwegian at the first of the film.
jmm