If a gun is put on the gorund, the gun's iron sight flip back into upwards position. Generally, guns on the ground seem to ignore anim sources, so that the hasOptics animation is not correctly
Likewise, if a weapon is retextured using hiddenSelections/hiddenSelectionTextures in the config, the override will be ignored and the original texture will always be used.
Put a gun on the ground. The sights will show up wrong. If the weapon has hidden selections, ti will be textured in the original color, not with the texture from the config.
See http://cloud-2.steampowered.com/ugc/846951660449148539/9E273D818152D4322E475A55AEAA5D632D2C64DE/ for an example of this effect. Note how the sights are flipped up in spite of the mounted scope.