This modelling is based on the concept art of Luke Viljoen.

I made this in Maya, textured in substance and rendered it with Arnold.

You can find the original concept here; https://www.artstation.com/artwork/LgVl0 .

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I made this weapon for the purpose of an other project. Even if it will  be used as a simple asset of the scene, I decided to render it  separately and display it here as it is also a part of the series I want  to make based on Luke Viljoen concepts.