Project "21Gun" - PHASE 1 (Highpoly)

This is some renders of the Highpoly stage (for baking normal later) of my project "The 21Gun".
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My target for this project is to create a weapon believable in the near future (next 10 years or less), hence its shape and mechanism are very close to modern guns. Otherwise, in my opinion, "energy" guns (like plasma, laser, supersonic...) won't become standard too soon, so I stick with traditional bullets that are detonated by powder (they will have some modified and upgraded for sure).
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And here's is my idea: The exoskeleton suits are pretty familiar these days and may become a basic standard in some military units very soon. The soldiers will be able to carry weapons and equipment much heavier than ever. Otherwise, our technology is better and more efficient over time, we can manufacture more complex weapons in lesser time. "21 Gun" is a high-flexible gun which can provide some huge advantages on warfare:
__1. It has 1 standard "Core" mechanism so we can "rush" manufacturing in large quantities.
__2. With suitable add-in attachments, it can become any 2 types of standard weapons: pistol, SMG, assault, shotgun, sniper... This's mean the soldier never need to change weapons because it's 2 in 1 gun. It can be a sniper and an SMG (or a shotgun and an SMG) at the same time!!!
__3. It is 60-90% heavier compared to the normal guns (there's no problem with the help of the exoskeleton) we can reload and fire at the same time!!! -> A gun never stop firing :D
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Note:
- This is the Highpoly phase in my workflow.
- Next, I'll do the Lowpoly and texturing.
- I made the lowpoly (with textures) here: https://www.artstation.com/artwork/ZGkRa8