Credit for the design of this model goes to dragonator. All that I did was go through the assembly and adjust the tolerances for a little better fitment, trimmed away some of the excess so it can be made with less material and split up a bunch of the pieces to optimize it for 3D printing and to allow for everything to be made without using any supports. All the pieces are to be printed in the orientation that they are in. For examples of painted guns and to get the great looking decals please see http://ytec3d.com/laser-pistol/
Refer to the picture with the exploded view to see how it is assembled.