As the title says. I'll try and list each missing texture (or related thing). Also mainly focused on the Insurgency part, but I'll mention some mods too.

OPTICS:
Every single one, excluding "sniper" scopes are broken in some way. The kobra is either missing its model and reticle texture, or the texture is fine but there's no reticle (varies between guns). All other (default) optics are completely missing textures, including the lens (the PO4 is the exception; the lens works like normal). All the workshop optics are missing the lens texture but the rest of the model is fine.

UNDER BARREL/RAIL ATTACHMENTS AND RAILS:
Grips and GP35s are entirely missing textures on all AKs (as well as the solo GP35). On any weapon where a rail is added for an optic, the rail is missing textures (excluding the FAL/L1A1, Mosin, and RPG). Bipods are missing textures on the M14 EBR, M16A1, and M40A1. M203s don't have textures on the M4A1 or M16A1. Light/laser mounts on the Sterling and RPG are missing textures, same with the extended mag on the FAL and L1A1.

MODS (I know these aren't necessarily Knife Kitty's fault, but I'm putting them anyway):
AK Mod Pack -- On the AK74, AK74N, AKM, AKMN, VPO-136, and VPO-209, the sight on the GP35 is missing textures, nothing else tho :/. GP35 on all other AKs is completely broken, and all the same problems from above. All my other mods (at the moment) (Gewehr 1898, HK416, SCAR Pack, and AR15 Pack) have the same sight problems, and the Mk20 Mod 0 (SCAR Pack) is missing the bipod textures. The only errors in the mods are the ones I listed.

To get to the point, does anyone know how I can fix these errors? I mounted the Insurgency path, which fixed most of the problems, but not these. Any help is appreciated.