I think it is safe to say that revolvers cannot slam fire, but blackpowder revolvers can chainfire. If burning powder or the sparks from one cap reach the powder of another chamber, both/multiple will fire, surely doing damage to your pistol. As stated before any free floating firing pin weapon could slam fire, either intensionally or accidentally. You could conceivably wedge the firing pin foward which would make your firearm fully automatic (so to speak) but if the firing pin is lodged forward it will fire without stopping until the magazine is empty. I've never heard of any modern pistol (like glocks) slam firing, but if they have free floating firing pins, they could.