Untextures scopes and silencers help

Has anyone figured out how to keep the textures of the scopes and silencers on all modded guns like the m416 CQB and the m4a1 sopmod? only some guns modded to the m417 like the ak-103 has the correct textrue for the scope unlike other guns that has been grayed out.

To get those textures in the iTech scopes, you have to use a built in gun like the TAR21, so if you mod a TAR21, to the M417 Combat, the iTech WILL show and other guns with iTech scope, for the silencer I have no idea.

yea but theres something that still puzzles me like the ak-103 it never has an itech scope built in and when it was modded to the m417 it showed the itech scope with texture