I crafted this gun I bought from a gun shop. When I first pulled it out it looked as it did in the menu screen/blueprint icon. After I added a sight to it, it looked like a completely different gun. Now regardless of the sight being on or off the gun looks like this other model. It still reloads like the gun it is supposed to look like but the new model behaves as its reload should, so its really awkward looking. Recrafting the gun(fortunately with better stats for me) seemed to bring the proper model back.