A: Pressing the ZERO UP button on certain attachment sights causes a white out/Blue out FPS drop and complete loss of sound and FPS drop to ~6 FPS.

B: Pressing the ZERO DOWN button on certain attachment sights causes an extreme Zoom/FOV often clipping through what I believe is the characters head.

It can only be corrected by:

1. Changing to secondary sights and back.
2. Removing and replacing the sight through inventory.
3. Switching fire mode, temporarily fixes it however the previous fire mode 'holds on' to the bugged view/zoom/FOV so switching back to single shot, for example, returns the problem. {F24062}