When you are holding a rifle (or any weapon capable to have extra optics) with attached optics on it, the ironsights are by default flipped down (in order not to disrupt optics sight).

If you drop the weapon on ground then you will notice that the ironsights (back and front) are now flipped up with additional optics still attached.

Same issue occuring for any weapon addon based to original (at least for my addons this happening). {F22312}