Here is my PBR-updated version of my M4A4 Fusion skin.

I made some more additions to the model, improved the plasma and used projection mapping from multiple angles to get the best result for each part.

To match the new guidelines, I have removed the baked lighting and made sure to stay in the specified color range.
In addition, I have made a custom wear map, so the weapon wears down realistically without affecting its look too much (see the second-last image).

So I hope you like the end result!

I am planning to post more color variants down the line, so maybe let me know which ones you would want to see!

Font family used (both on the skin and in the showcase):
TeXGyreHeros [www.1001fonts.com]