I have downloaded a mod from @largeaj2020 and that is the SC-2010 gun. I noticed in the descriptions that it has some "Non-existent" textures are in the gun.
These are the ones I'm talking about.
If this was fixed, he would gladly appreciate the help. I appreciate it if someone can do this thing. Here's the link of the weapon mod. https://www.gta5-mods.com/weapons/sc2010