With the top of the front sight post being 2.6" above the centerline of the barrel, it doesn't take much rotation to put the sights off line (probably no more than the tolerance between the barrel index pin and the notch in the top of the receiver).
As long as the rear sight isn't all the way to the side, you should be ok.
Personally, if it were my rifle, I'd put the BUIS on it, zero it, and then add an EOTech or Aimpoint and never use the iron sights again (except in case of failure of the optic).
~Dan
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