https://steamcommunity.com/sharedfiles/filedetails/?id=2929418334
The GR9 machinegun's visual model has two issues that I've seen so far.
Firstly, as the screenshot above shows, it tints incorrectly. The entire weapon is tinted in the selected colour, including the scope and the scope's glass. Realism aside, this is inconsistent with the way other weapons tint. For those, some elements retain their original colour - typically the barrel, grip and other metal elements. The way the GR9 tints makes it look like a broken texture, rather than a custom paintjob.
Secondly, the weapon's animations appear broken. The weapon is using the same reload animation as the M60, meaning the character mimes opening and closing a top hatch that the GRN doesn't have. Is the weapon even supposed to have its own reload animation?