Below, is a photostat of a typical Martian native gun team (Black Hat Miniatures). Although their guns are primitive, and the crew is next to naked, do not discount their potential. The guns are breechloading, with cartridges. The purpose of the 'rammer' crewman is unknown, although it is thought that his function is to swab the barrel from the breech. Also, as the carriage is capable of hovering above the ground, it is a highly mobile gun, capable of maintiaining a march pace with crewmen pulling it in relays.
Additional photostats of this weapon and other Martian natives can be found at the following telephonic difference web location:
Enjoy, and beware.