Hey. Ask your weapon guy to take a look at m4a1 textures.
He did a good job on new SKS damage system, looks solid.
Maybe some refresh of M4 textures if he has some free time? Current aren't that terrible, but since M4 is in top tier list - I think it needs a bit of love. No need to go crazy and fully replace it, the geometry itself is still pretty ok. But textures were done back then at the beginning of Dayz Standalone. Some new nice color and smdi maps and it will serve a lot more (plus new sand skin for Badlands if you'd like). This is only M4 wise, since it is in top tier and has the weakest textures among all weapons.
Others - still feels pretty clean. AKM and AKs were done very solid back then, so even now looks pretty ok, and FAL - it still shines.
Anyway, just a suggestion, pretty sure you have thougth about it too.
Have a nice day.