Reiterated from my comments from the github.
Colors :
Change to white stray too far into the cartoon sci-fi side of things. We don't have to go full milspec like Bay, but gunmetal grey/black is better.
Oversaturation of colors also contribute to this problem.
Shotgun is inconsistent with the other guns. If there was to be a contrast, it is too muted to tell, and isn't explicitly obvious what the contrast is supposed to mean at a glance, since it is too generic to derive any context from it.
Proportions :
Triggers for most of the guns are inconsistent and problem lies with the ones that are disproportionately large.
Stocks for the laser rifle and ion are too short.
Ions and laser rifles are vertically stretched.
Ions, and disruptors especially, look very bulky and cartoonish.
Outlines :
Blaster pistol grips have no outline, inconsistent with the others.
Style :
It isn't a bad thing that these sprites are being updated to be more futuristic, however the stylisation is far too inappropriate for the tone for the server.
The cartoonish proportions as well as the oversaturated colors lend the tone to be more retro sci-fi rather than corporate dystopia.
This could work on a server like Goon, but we are a HRP server, and the tone is much more different.