Leave the sight in this position for 99% of your shooting.Д©. Remember you're adjusting the FRONT SIGHT for elevation, not the rear, and that each click is about 1/2' Point of aim should be point of impact of bullet.Д§. Small aperture, nose to firing handle weld.Д¤. If there are 6 clicks then the sight needs to be set at вЂ“4 clicks (instead of вЂ“2).Дў. There should be 3 clicks between 3 and 4 on the

Marked 6/3 (rather than 8/3) also some are in вЂhalf-clicksвЂ™ as well.

Sight should be at 8/3 -2 clicks, that is, all the way down, not up a click. 007 to make up for the sideways movement of the aperture on the windage screw as it pivots.Д«y installing our same plane rear aperture you now can sight in your rifle using the smaller aperture and shift back and forth between the two apertures as your light and range needs change without having to do mental gymnastics to know where your bullets impact will be.ДЎ. We have also offset one of the apertures by. Our aperture sight for this weapon has both the large and small apertures on the same plane so there is no difference in the point of impact when you shift from one to the other. They just figure that their rifle is doing something strange. Most people are completely unaware of this elevation change that occurs when the aperture is shifted from one to the other. The only reason for the various shifts would be for changes in the ammunition used by the military over the course of this weapons employment. The shifts for these shorter sight radius weapons are 3.48, 4.25, 5.96 inches respectively. The shorter sight radius (14.5 inches) of the M4 carbine and weapons of similar configuration increase the amount of point of impact shift. 024 offset giving a 4.36 inch shift in P.O.I.ДЄll of the points of impact shifts shown above are for the standard barrel AR-15/M-16 that has a sight radius of 20 inches. 017 offset, which shifts point of impact 3.06 inches at 100 yards. This gives a 2.52 inch shift in point of impact at 100 yards between the two apertures. However the aperture shift is still with us today.Д¬omparing some of the rear sights available today there appears to be 3 variations available. This system eliminated the need for an elevation shift between the large close quarters aperture and the smaller long-range aperture. The new A2 rifles and carbines employ a rear sight system that includes a range cam to allow the shooter to more precisely adjust the ballistic arc to their needs. While this system would not give the shooter an exact elevation adjustment for a specific range, it would under battle conditions put the bullet close enough for government work so to speak. To obtain the ballistic adjustment needed for longer range shooting the original rear sight had one aperture higher than the other. AR-15/M-16: Rear Sight Elevation Shifts and the need for a Same Plane Aperture SightДЄs originally designed the AR-15/M-16 sight system adjusts for windage at the rear assembly and for elevation in the front to zero the rifle to the individual shooter.

A2 small vs big aperture