Top Mounted RMR vs 45 Degree Offset

Published on December 8, 2021
Duration: 11:32

This video compares top-mounted RMRs versus 45-degree offset red dots on an AR-15 platform. While offset mounts offer better ergonomics and cheek weld for rapid fire, top-mounted RMRs excel in weak-hand shooting scenarios. Transition times varied depending on the direction (magnified to red dot vs. red dot to magnified), with offset being slightly faster for close-to-far transitions and top-mount faster for far-to-close.

Quick Summary

Offset red dot mounts offer better ergonomics and cheek weld for rapid fire, while top-mounted RMRs are superior for weak-hand shooting. Transition times vary: offset is slightly faster from magnified to red dot, but top-mount is faster from red dot to magnified due to eye relief.

Chapters

  1. 00:00Intro: RMR vs Offset Mount Debate
  2. 00:25Custom AR-15 Build Showcase
  3. 01:35Ergonomics & Transition Mechanics
  4. 02:09Durability & Protection Analysis
  5. 03:32Live Fire: Magnified to Red Dot Test
  6. 05:09Live Fire: Red Dot to Magnified Test
  7. 06:32Rapid Fire Drills & Cheek Weld
  8. 08:05Weak Hand Shooting Comparison
  9. 09:29Conclusion: Offset vs Top Mount

Frequently Asked Questions

What are the main differences in ergonomics between top-mounted RMRs and 45-degree offset red dots?

Top-mounted RMRs often require breaking cheek weld, leading to a 'chin weld' during transitions. Offset mounts allow for a tighter rotation and maintain a more consistent cheek weld, which is beneficial for sustained fire.

Which optic mounting style is faster for transitioning between magnified and red dot sights?

Transition times vary. Moving from magnified to red dot was slightly faster with an offset mount (0.96s vs 1.02s). However, transitioning from red dot to magnified was faster with a top-mount (0.95s vs 1.26s) due to eye relief alignment.

Is a top-mounted RMR or a 45-degree offset mount better for weak-hand shooting?

Top-mounted RMRs are significantly easier to acquire targets with when shooting from the non-dominant shoulder (weak hand). Offset mounts can be more challenging in this specific scenario.

What are the pros and cons of top-mounted RMRs versus 45-degree offset mounts?

Offset mounts offer better ergonomics and cheek weld for rapid fire. Top-mounted RMRs excel in weak-hand shooting and may be preferred for certain duty roles. Both have different transition speed characteristics depending on the direction of the transition.

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