What Is The U.S. Military's Top Tier 5.56 Round? (M193 vs M855 vs MK262)

Published on May 26, 2026
Duration: 19:55

This video provides a comprehensive comparison of three common 5.56x45mm NATO rounds: M193 (55-grain FMJ), M855 (62-grain penetrator), and MK262 (77-grain OTM). It details their historical development, ballistic performance (velocity and accuracy), and intended applications, offering practical insights for shooters to select the appropriate ammunition for their needs. The analysis includes range testing data and expert commentary on each round's effectiveness.

Quick Summary

The MK262 77-grain Open Tip Match (OTM) round is considered the top-tier for precision and long-range 5.56 shooting, offering superior accuracy around 1-1.5 MOA. M855 (62-grain green tip) excels at barrier penetration, while M193 (55-grain FMJ) is a fast, cost-effective option for training.

Chapters

  1. 00:00Introduction: Choosing the Right 5.56 Round
  2. 00:43Comparing M193, M855, and MK262
  3. 01:22Deep Dive: M193 (55 Grain FMJ)
  4. 02:18Deep Dive: M855 (62 Grain Green Tip)
  5. 03:09Deep Dive: MK262 (77 Grain OTM)
  6. 04:00Range Test Setup & Zeroing
  7. 04:39M193 Range Test Results
  8. 05:42M855 Range Test Results
  9. 07:38MK262 Range Test Results
  10. 09:07Analysis: M193 Performance
  11. 09:57Analysis: M855 Performance
  12. 10:16Analysis: MK262 Performance
  13. 10:59Conclusion: Which Round to Choose?
  14. 11:51Final Thoughts & Viewer Engagement

Frequently Asked Questions

What are the key differences between M193, M855, and MK262 5.56 rounds?

M193 is a 55-grain FMJ for speed and training. M855 is a 62-grain 'green tip' with a steel penetrator for barrier penetration. MK262 is a 77-grain OTM for precision and long-range accuracy. Their velocities and grouping capabilities also differ significantly.

Which 5.56 round is best for accuracy and long-range shooting?

The MK262 77-grain Open Tip Match (OTM) round is best for accuracy and long-range shooting. It provides a flatter trajectory and tighter groupings, typically around 1-1.5 MOA at 100 yards, due to its heavier projectile and match-grade construction.

What is the purpose of the M855 'green tip' 5.56 round?

The M855 round, identified by its green tip, is designed for enhanced penetration against intermediate barriers like light cover or some body armor. It's a 62-grain projectile with a steel penetrator core, offering a balance between velocity and penetration.

How does projectile weight affect 5.56 ammunition performance?

Heavier projectiles (like 77-grain MK262) generally offer better accuracy, a flatter trajectory, and more retained energy at longer distances, but at a lower velocity. Lighter projectiles (like 55-grain M193) are faster, making them good for training and general use, but may be less accurate at range.

What barrel twist rate is recommended for different 5.56 rounds?

For lighter 55-grain M193 rounds, a 1:12 twist rate is often sufficient. Heavier projectiles like 62-grain M855 and 77-grain MK262 generally perform best with faster twist rates, such as 1:7 or 1:9, to ensure proper stabilization and accuracy.

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