M277 Scope bug (?)

So, I've noticed there is a visual bug (?) When using the 3x Scope on the M277 where the thumb appears on screen on the scope... I've found it on multiple games, so it is not a punctual visual bug. This is what I know so far:

M277 With Baker 3,00X AND Short Grip (the one that costs 30, not 20). When this two go together, the thumb appears on the low-half of the scope. 

If this combination of attachments are to be used on different guns, the thumb may still appear but it's not so annoying; you can see it on the bottom-left of the scope but it does not block any visual at all.

I hope this is useful and that it can be fixed sooner than later (though I was using the m277 just for a mission, and once done I didn't receive the reward, so... but that's for a different entry).