Problem with AR-15 rear sight aperture

Published on February 22, 2019
Duration: 1:45

This guide explains the proper use of AR-15 rear sight apertures. It highlights that the large aperture, often perceived for close-range, introduces parallax errors and is unsuitable for precise shooting. For any shot requiring accuracy, even at 25 yards, the small aperture must be used to maintain a consistent sight picture and avoid aiming errors.

Quick Summary

For precise shooting with an AR-15, always use the small rear sight aperture. The large aperture, often mistakenly thought for close range, introduces significant parallax error due to head movement, causing shots to miss your intended point of aim even at 25 yards.

Chapters

  1. 00:00Introduction to AR-15 Sights
  2. 00:07Understanding Sight Apertures
  3. 00:14Small Aperture for Precision
  4. 00:18Large Aperture for Close Range?
  5. 00:29The Problem with the Large Aperture
  6. 00:39Parallax Explained
  7. 01:32Conclusion: Use the Small Aperture

Frequently Asked Questions

Why is the large aperture on an AR-15 rear sight not good for precise shots?

The large aperture on an AR-15 rear sight is not suitable for precise shots because it is highly susceptible to parallax error. Even minor shifts in your head position can cause your point of aim to deviate from your point of impact, leading to inaccurate shots.

What is parallax error in firearm sights?

Parallax error occurs when the shooter's eye is not perfectly centered behind the rear sight aperture. This misalignment means that as the eye moves, the apparent position of the front sight relative to the target changes, causing the point of impact to shift.

Which aperture should I use on my AR-15's rear sight for accurate shooting?

For any shot that requires precision, you should always use the small aperture on your AR-15's rear sight. The smaller opening significantly reduces the effects of parallax, allowing for a more consistent sight picture and greater accuracy.

Can the large aperture on an AR-15 sight be used for close-range engagements?

While the large aperture on an AR-15 rear sight might seem intuitive for close-range engagements due to its wider field of view, it is still prone to parallax errors. For any situation demanding accuracy, even at close distances, the small aperture is the recommended choice.

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