[T5] Weird gun textures

[Evolight]

Weird textures. at least.. i call them weird because i have not a single clue what they are for

these are some images for the thundergun, grabbed all of the specular maps, color maps, cosine maps, normal maps and im left with these.

can someone tell me what these are for and if it makes a huge difference on the gun if i dont use them? (weapon porting)

-thanks