I bought a S&W15 Optic Ready AR. Nice gun. Shoots well and all that. Bought a Yankee Hill folding rear and Brownells flip-up front sight. Went to zero it at 50 yards.......... With the front sight post screwed IN/DOWN all the way it's still hitting 16" low. I ran a straightedge from the flat top to the railed gas block and they are the same height. Can two different sight mfgs. be that far off to make them incompatable? I was trying to get off cheap, because I won't use them that often. Mounting a red dot on it for primary use.
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