groover000
Member
- Joined
- Aug 6, 2007
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- 1
I have tried searching for this but I am getting no results. What is the differences between an A2, A3, A4 on ar-15 rifles? Pics would be helpful if you have them. Thanks in advance.
A1/SP1 rifles have a round front sight post with 5 adjustment clicks.I see people making references to "A2 style sights" so now I guess they're contrasting them with A1 rather than A3/4-style sights.
wrong. the larger ring is for night shooting when your pupil diameter increases you are not able to use the day sight (smaller ring). its not a 'ghost ring for close range'You can still flip the aperture back and forth for a close range and a long distance zero, but the close range sight is the large ghost ring
No, I'm right. The larger ghost ring is lower than the smaller peep. It is a close range sight. The small peep, being higher, is for long range use.wrong. the larger ring is for night shooting when your pupil diameter increases you are not able to use the day sight (smaller ring). its not a 'ghost ring for close range'
Soldiers are taught to look over their sights for night shooting.
I never said one should zero the rifle with the large ghost ring.we never zero'ed with the larger ring,
Creature, your description is incorrect. Technically speaking, since we are discussing military nomenclature, the top rifle is not an M16A2 and the bottom rifle is not an M16A3.
However, even if you were just using the term loosely to describe the upper receiver, the top one would be an A2; but the bottom would be an A4.
Matt-man described the military nomenclature and the manufacturer confusion very well.
They aren't incorrect when describing A2 upper receivers. The fixed carry handle with the elevation wheel is identical to the upper on the M16A2. Although, if you really want to get technical, an A2 upper assembly should not have an HBAR barrel. It would have a 20" Govt. profile (lightened under the handguards) with a 1/7 twist and chrome lining.How is it that the majority of folks in the civilian AR industry have it all wrong when it comes to describing A2 and A3 uppers...and why does it persist?
Bear in mind I qualified on these courses twenty five years ago but knowing the Army, not a whole lot has changed.
How is it that the majority of folks in the civilian AR industry have it all wrong when it comes to describing A2 and A3 uppers...and why does it persist?:
but the close range sight is the large ghost ring
http://groups.msn.com/TheMarylandAR15ShootersSite/whatisana1a2a3ora4.msnwThere is a large aperture for low light/close in (< 200M) shooting and a small aperture used for longer range shooting (300m+).
Q: Can I use the A2 aperture on my A1 Rifle?
A: Courtesy of Forest
Yes! In fact it’s recommended. By using the A2 aperture instead of the A1, you gain a large ‘ghost ring’ for close quarters shooting, and a smaller hole for precision/long distance shooting. ....
http://www.xssights.com/faqs.html#faq4FAQ # 4
AR-15/M-16: Rear Sight Elevation Shifts and the need for a Same Plane Aperture Sight
As 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. To obtain the ballistic adjustment needed for longer range shooting the original rear sight had one aperture higher than the other. 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.
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. This system eliminated the need for an elevation shift between the large close quarters aperture and the smaller long-range aperture. However the aperture shift is still with us today.
Comparing some of the rear sights available today there appears to be 3 variations available. The 1st style (and oldest) has a .014 offset. This gives a 2.52 inch shift in point of impact at 100 yards between the two apertures. The 2nd style has a .017 offset, which shifts point of impact 3.06 inches at 100 yards. The 3rd style has a .024 offset giving a 4.36 inch shift in P.O.I.
All 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. The shorter sight radius (14.5 inches) of the M4 carbine and weapons of similar configuration increase the amount of point of impact shift. The shifts for these shorter sight radius weapons are 3.48, 4.25, 5.96 inches respectively.
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.
Most people are completely unaware of this elevation change that occurs when the aperture is shifted from one to the other. They just figure that their rifle is doing something strange.
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. We have also offset one of the apertures by .007 to make up for the sideways movement of the aperture on the windage screw as it pivots.
By 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.