When switching to a secondary sight, in the current build, you bring your eye to the sight. This blocks out most if not all of the left hand side of the screen, disallowing you to see anything unless you lean left. I suggest altering that function by making the character rotate the gun to the left, effectively and efficiently bringing the sight to the eye, as that is how it is actually done.
First picture illustrates my problem, cant see anything on the left, whereas the second picture provides clarity on the situational awareness.
The new optic suggestion would be something along the lines of a Aimpoint T-1 or T-2 a nice micro red dot, Vortex would work too.