I find it strange why you would need a collimator sight attached since the main optic is about a x3 magnification, so it is not as though you would lose the target through the main optic at close range.
Even at close range, less than 500m, it is no problem aiming the main optic. If the target is within tens of meters then I'm sure you'd switch to iron sights.
Indeed, the collimator is significantly out of line with the main optic and, of course, that innaccuracy gets worse at range.
The collimator also rotates with no markings or detent ability to co-witness it with the main optic/elevation mechanism, therefore, bears no relationship to the impact point of rounds.
To my mind it really only works as an emergency sight in case of failure or damage to the main optic. It is also not ideal under any circumstances having to stick your loaf above the parapet and look down into the collimator.
Also, why does the point of the sight hairs not meet the top edge of the black, I can't see what I'm looking at?
If you can answer my questions your doing well