i tried to model these guns as close as possible to the ones used in-game.
the model is divided i three parts : front middle and back, the middle and the back part are splitted in half to be heasier to print, all the pieces can be held in place using the pins provided (apparently in some contests you are required non to glue your prints)
the print in the picswas made using ABS at 0.24 layer height , 10% infill
note that the golden parts are reliefs and are not simply drawn on the print
to paint it i used acrylic spray for the blue and brushes for the gold parts.