I've just encountered a bug (I created a ticket as well): if you buy a skin for specific weapon (in my case it was shotgun) you will get Black Adder error and then: no more aim on sight for this weapon. I don't really know how to fix this, I tried to change skin back to default and it didn't help at all.
So be careful with skins lol. Maybe someone was even able to fix it.
So be careful with skins lol. Maybe someone was even able to fix it.