Smyth Busters: Does Your AR-15 Really Need Backup Sights?

Published on November 29, 2022
Duration: 8:47

This guide, based on insights from Brownells' Steven and Caleb, details the situational necessity and installation of backup sights on an AR-15. It covers considerations for range versus defensive use, different cowitnessing methods (absolute vs. lower third), and the importance of redundancy in optics for critical applications. The expert advice emphasizes that while not always mandatory for a pure range gun, backup sights are highly recommended for any serious-use firearm.

Quick Summary

Backup sights for an AR-15 are situationally dependent. While not strictly necessary for a pure range toy where optic failure is a minor inconvenience, they are highly recommended for defensive carbines or any serious-use firearm. They provide crucial redundancy against optic failure (battery, damage) and can sometimes offer superior performance in specific conditions.

Chapters

  1. 00:00Introduction: Backup Sights Myth?
  2. 00:26AR-15 Setups: Optic vs. Backup Sights
  3. 00:55Cowitnessing Explained
  4. 01:22Personal Preference: Always Backups
  5. 02:08Situational Need: Range Gun
  6. 03:01Backup Sights for Reliability
  7. 04:07Situational Need: Defensive Carbine
  8. 05:34Absolute vs. Lower Third Cowitness
  9. 06:22Competition Considerations
  10. 07:52Conclusion: Backups Are Plausible

Frequently Asked Questions

Does every AR-15 need backup sights?

Not necessarily. For a dedicated range gun where optic failure is only an inconvenience, backup sights are less critical. However, for defensive carbines or any serious-use firearm, they are highly recommended for reliability and redundancy in case of optic failure.

What is cowitnessing with AR-15 optics?

Cowitnessing on an AR-15 means aligning your iron sights with the aiming point of your optical sight. Absolute cowitness aligns them perfectly, while lower third places the iron sights in the bottom portion of the optic's view, preferred by some for a cleaner sight picture.

When are backup sights most important for an AR-15?

Backup sights are crucial for defensive carbines or duty weapons. In a life-or-death situation, if your primary optic fails due to battery issues, damage, or environmental factors, backup sights provide an immediate and reliable aiming solution.

What are the benefits of backup sights beyond redundancy?

Backup sights can sometimes offer better accuracy in specific lighting conditions or when experiencing eye fatigue compared to a malfunctioning or dead-battery optic. Lightweight options like Magpul MBUS are affordable additions.

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