Well the HC are from the future and the cylinder takes a single cartridge, and those cartridges don't look like some kind of speed loader [b]to me[/b]. That cartridge for all we no doesn't contain actual bullets, it could have some type of energy divided up in some way into x amount of shots. Maybe the hammer provides enough energy to the dot in the middle of these cartridges with some kind of electrical setup. Some of those LMG's though are confusing.