It’s just the usual DF sight bugs, and they happen about as often as the tank gun sight going completely black.
These sights are just awful. I really hope they either change them or widen the camera FOV to blur them out.
As far as that sight bug, I haven’t noticed it since the only time I have ever used the Lewis is on the practice range, and that was only a few seconds till I realized I hated the gun sight enough I wasn’t ever going to use it as it was. However it didn’t have the bug when I tested it.
I won’t use the gun because the sights are unbearable. It’s not a huge loss for me as my favorite MG in the game is the BAR 1918 A2. However it is a waste of a gun that would probably be a nice MG if you could actually see the target through all that crap they call a gun sight. All they need to do is fold the sight down and it would be usable.
iirc its a LOD bug, has been reported but no official response yet

