Quite busy these days but I've been able to make this one concept along.
VIDEO
It is energy equipment. No projectiles at all. Battery is socketed in rear sections behind grip. Body hides bunch of three barrels/emitters inside. Core of structure is chamber in the middle . Scope is linked to body and is displaying (beside other) actual status of battery and other information regarding internal parts. These information are available only in scope and not also on the body itself which has been found as limitation while operating. On the other hand new platform of battery provides enough energy for 94 rounds. Design office is still working on elimination flash effects while firing. Also tests uncover defects occuring while constant firing. In case of constant suppress fire of 3 and more battery packs in row, generated heat melts down front mask. Planned bigger cooler inside body will fix this problem soon.
I made this concept in 3ds max and render engine I used V-ray. Model is highpoly. Due lack of time I didnt make full textures but used shiny materials.