Originally Posted by bkt
I understand what you're saying...the front site post top looks enormous relative to a small target 100 or more yards out.
I thin my front sight posts so that the width of the post equals the width of the aiming black on a target. In other words - when sighting on a target at 600 yards, the left and right edges of front sight post line up with the outer edges of the black "bullseye" on the target. If the front sight post isn't exactly centered under the bull, it is easily spotted vs. trying to judge how much 'overhang' you have on each side of the bull using the wider std post.
The drawbacks to this method are that the front sight is harder to acquire in quick sighting situations (CQB) and that the post is no longer 'square' but rectangular - more like a sight blade
. What that means is that elevation adjustments to the front sight blade can only be made in full turn increments, in order to keep the thin part of the post aligned with the barrel. This isn't a problem for dedicated target rifle, but for a general multi-purpose rifle you are better off staying with a square post.
Another accuracy 'trick' is to lock down the front sight post. Try putting your finger on top of the front sight post of a standard AR15. Push down slightly and wiggle your finger around. Yes, the front sight post MOVES!
The movement of the spring loaded plunger and the clearance in the sight post threads will allow the front sight post to move between shots. Not a problem under most conditions, but it can cost points in a long range National Match. The common 'cure' is to remove the front sight post and then extend the thread in the front sight base all the way through and out the bottom. After reinstalling the front sight post you insert a socket head (hex) set screw from the bottom of the sight base and tighten it down against the bottom of the front sight post screw threads. The front sight post is now solid and will not move.
You just have to remember to loosen the set screw before trying to make elevation changes using the front sight post.....
For what it's worth.
Round sight posts reflect more light (glare) vs. a flat surface as on the square sights posts. In either case, a sight 'smoker' is your friend when you want a nice BLACK non-reflective front sight.