@Vidgamenut
All right, I'm glad that helped! Also, nice work for making black reskin on that gun.

@UEF Thank you!
https://steamhost.cn/steamcommunity_com/profiles/76561198880438184/screenshot/2475370829997167310/

@Vidgamenut
Basically, at the end of your .vmt files must have _attblk suffix in them.

And in the injector .lua file must contain for example:
INJECTOR.SWEPs = {"mg_mike4"} -- Change this to your weapon name.

INJECTOR.Slot = 703 -- Attachment slot, this doesn't matter, as long as it is on top of everything.

INJECTOR.Attachment = {"att_skin","att_skin_black"} -- The first one is category ("att_skin"), the second is the selectable attachment in customization menu ("att_skin_black").

@UEF Would you mind explaining how this system works? I am trying to make a black skin for the Cronen Squall. I have the textures, I just don't know how to implement them into the game using your injector system.

The hands that I use in the screenshots are hand rigs from the "Modern Warfare 2019 SWEPs - Rigs", and here's a link for that said mod for your convenience:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2802427264

Keep in mind, they're not C_Hands.

C_hand Model?

@Noel
The Black FR 5.56 is now fixed and available again!
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2822616137

I wonder if you could add the FAMAS back. Along with the No rails receiver attachment.

@Vidgamenut
No, I haven't made a black reskin for that gun yet (or any unofficial MWSWEPs particular).

Currently, I'm only focusing on making black reskin mods for official MWSWEPs that made/released by Viper, or Mushroom Guy.

Just wondering, do you have a black X12?