End up designing the whole thing from the ground up. Rifle for the heavy intercessors.
"Promotional" video
Collage of concept I can find, red circle are some inconsistency I've found throughout the development.
Series of Development
Later I've decide to delve into the parts and mechanic so "it make sense."
First adjustment is to the barrel section, second overhaul is for the ammo box.
Purity Seal Process
The purity seal and the maintenance box are made seperately.
The baking and the material creation in substance painter.
And that's all!
3D viewer for the curious.