I know an "F" marked front sight base is for use with flattop upper receivers. It is used so that back up irons will properly zero. At what range does it become an issue to not use an "F" marked front sight base? When does it affect your point of impact? Considering most companies do not use "F" marked front sight bases, (RRA, Bushmaster, etc...) as a matter of standard practice, will it hamper accuracy? I know it all comes down to the question,"what is the intended use of that particular AR"? Any information would be most useful. Thank you.
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