This is an Arctivist. Looks very much like an old world gun. However it fires very differently then an old world gun. Were as in our world we fire projectiles they use photon energy. The mechnaical part is showing the trigger mechanism. That round cylinder in the back is called a glyth crystal. Think of it as a battery. The other one too is a glyth crystal that is connected to the trigger. When two glyth crystals come into contact they equalize energy. This gives the smaller glyth a charge and basically this carries the bolt or shot. When the trigger is released it moves to the front and presses into that thin wire glass. This causes the energy to flow into the chamber and be released as a bolt or shot. The larger the supply crystal the more powerful a shot they have. This is the general concept of all fire arms in the Lyorta series. Cannons have similar designs only they are much larger. Hopefully this makes sense or at the least allows for a general idea of the concept.