A number of the weapon attachment slots (scopes, grips, etc) are currently missing the option to utilise hiddenSelectionTextures; a bit unusual, as there are other slots that already feature them such as magazines. Consequently, this requires anyone working on the game to create multiple .p3d's with the correct textures applied as opposed to a singular .p3d and calling the textures as needed. It's a small thing, however it'd go a long way towards optimising modifications and reducing the amount of clutter in them.