I'm quite sure you are aware of this, but just to make sure. When switching from third person to looking through the ACOG on an M4{F376320}
{F376319}, there is a white texture popping up for about a second (See Screenshot #1). When switching to looking through the scope from first person view however, this does not occur, but the scope texture is blurred for roughly the same amount of time (See Screenshot #2)