Cowitness VS Lower 1/3 and Iron Sights, Which is Best?

Published on August 5, 2019
Duration: 14:54

The VSO Gun Channel recommends Lower 1/3 cowitness for most AR-15 users, offering a clearer optic window than Absolute cowitness. While Absolute cowitness allows the red dot to align directly with iron sights, Lower 1/3 positions the irons at the bottom of the optic for better visibility. The video also critiques Trijicon's stock MRO mount, favoring Midwest Industries for their QD capability and zero retention.

Quick Summary

Lower 1/3 cowitness is generally preferred for most AR-15 setups as it provides a clearer sight picture by positioning iron sights lower in the red dot optic's window. This setup reduces obstruction compared to Absolute cowitness, where sights align directly with the dot.

Chapters

  1. 00:00Introduction: Lower 1/3 vs Absolute Cowitness
  2. 01:18Visual Comparison: Sight Picture Differences
  3. 01:53Mount Critique: Trijicon MRO vs Midwest Industries
  4. 03:11Iron Sight Profiles: Fixed vs Flip-Up
  5. 05:15Height Over Bore and Ballistic Arc Explained
  6. 06:07Range Testing: Point of Impact Shift
  7. 08:27Recommendations for Absolute Cowitness
  8. 09:49The 'Ghost Ring' Trick for Absolute Cowitness

Frequently Asked Questions

What is the main advantage of Lower 1/3 cowitness over Absolute cowitness?

Lower 1/3 cowitness generally offers a clearer sight picture through the red dot optic because the iron sights are positioned lower in the optic's window, reducing obstruction compared to Absolute cowitness where they align directly.

How does optic height affect shooting at close range?

Taller mounts, like those used for Lower 1/3 cowitness, increase the height over bore. This offset is crucial for understanding point-of-impact shifts at very close distances due to the firearm's ballistic arc.

Which mounts does the VSO Gun Channel recommend for Trijicon MROs?

The host strongly advises against Trijicon's stock MRO mount, calling it 'hot garbage.' He recommends Midwest Industries (MI) throw-lever mounts for their QD capability, zero retention, and lighter weight.

Can you use fixed iron sights with Absolute cowitness?

Yes, but fixed iron sights can clutter the optic window with Absolute cowitness. Flip-down sights are a better option for Absolute cowitness to maintain a clear view when not in use.

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