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Aiming dot sights are parallax-free, which means that the visible dot remains parallel to the barrel of your weapon no matter what angle your eye is to the sight. This means you don’t have to worry about centering the dot inside the sight.
Yes, all Trijicon ACOGs use glass-etched reticles.
What is an ACOG? ACOG is a name for a whole range of optics that vary in size, reticle magnification and even illuminance. ACOG stands for Advanced Combat Optical Gunsight. These are fixed power optics that can range from 1.5x to 6x with many options in between.
If you’re shooting at just 300 yards, you don’t have to worry about parallax. However, if you frequently shoot beyond 300 yards, your scope really should have parallax adjustment to help clarify your target focus. Most 12x and higher magnification scopes have an external parallax adjustment knob.
At short distances, the parallax effect does not affect accuracy. Using the same 4x scope at 100 yards, the maximum error is less than 2/10 of an inch.
Because a red dot is ideally projected to infinity, it is only parallax free for infinitely distant targets. In other words, a red dot sight is the worst case, NEVER free from parallax; Magnifying glasses are at least parallax-free at a distance.
Parallax correction is a feature available in almost all modern riflescopes. The effect of parallax is evident when your crosshairs appear out of focus in relation to your target and the focal plane of the scope.
The EOTech Holographic Sight also offers unlimited eye relief. It can be attached to a Picatinny or Weaver rail. This Parallax Free red dot sight, made in the USA, weighs less than 11 ounces and runs on two AA batteries.
The TA33 ACOG scope is designed to be zeroed at 100 yards using the top of the chevron reticle as the point of aim/point of impact (POA/POI). For the bullet drop compensator to work properly, a 100 meter zero should be verified. The 100 meter zero enables the BDC reticle to be used effectively at 600 meters.
ALWAYS ON, ALWAYS READY. Most ACOG® models are battery-free and feature a tritium/fiberglass reticle that automatically adjusts brightness based on available light.
The ACOG was originally designed for use with the M16 rifle and M4 carbine, but Trijicon has also developed ACOG accessories for other firearms. The models offer fixed magnification levels from 1.25x to 6x. ACOG reticles are illuminated at night by an internal tritium phosphor.
One of the often cited shortcomings of the ACOG is its weakness at close range. Experts and competitors alike speak of Red Dots’ effectiveness at these short ranges, and that reputation is well deserved.
Among the two brands, ACOG gets better marks for durability and longevity. You get higher quality glass, more magnification options, and longer-lasting illumination than EOTech. In the event of your optics malfunctioning or breaking, you have ACOG’s lifetime guarantee.
The further away from you, the ACOG is the best choice. They are designed for distance and accuracy. The red dot is intended for short-range shooting. Although both are accurate, it depends on the distance you are looking at.
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