Now, Ruger and every forum I read says the AR556 has a "F height" front sight, meaning it should correspond to a milspec height rear handle. This tells me one of three things: A) My front sight (or at least the post) is too short (and everyone, including Ruger, is wrong), B) my rear carry handle is too tall, (it's adjusted all the way down), or C) all the info I find is wrong. I just installed one though and it's too tall, to get the gun to shoot Bullseye at 50y, my front sight post is screwed nearly all the way out (to the point it's loose). Carry handles come in commercial height (apparently a result of Bushmaster being dumbasses and not raising the FSB on flatto) and milspec height: milspec is 0.04" taller. My understanding is this (and please correct me if I'm wrong): the A2 front sight is the standard height (used mainly on fixed carry handle guns) and the F type front sight is 0.04" taller used mainly on flattop AR15s. As many of you I'm sure know there are two different height front sight bases and two different height carry handles for AR15s.
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