Magazines, Accuracy, Reliability and More with the USMC M27 IAR

Published on January 3, 2018
Duration: 11:10

This guide details a critical maintenance technique for the USMC M27 IAR, focusing on the correct installation of the buffer spring to prevent malfunctions. It highlights potential user errors and emphasizes the importance of proper assembly for weapon reliability, drawing on insights from a former USMC service member.

Quick Summary

The USMC M27 IAR excels in accuracy and reliability, outperforming the M16A4 with its free-floating barrel and modern design, enabling effective engagement at 600 meters. Common issues include improper buffer spring installation and specific magazine compatibility challenges, particularly with earlier PMAG generations.

Chapters

  1. 00:00Introduction to M27 IAR Series Part 2
  2. 00:14Accuracy and Reliability Advantages
  3. 01:06Buffer Spring Installation Errors
  4. 02:35Firing Pin Spring Functionality
  5. 03:14Optics: RMR vs. SDO
  6. 04:12Blank Firing Adapter (BFA) Issues
  7. 04:47Magazine Loadout and Interoperability
  8. 05:58PMAG Compatibility Explained
  9. 07:04High Capacity Magazine Limitations
  10. 09:35Combat Performance and Portability

Frequently Asked Questions

What makes the USMC M27 IAR more accurate than the M16A4?

The M27 IAR offers superior accuracy due to its free-floating, heavier barrel and a more modern system design, which contributes to fewer malfunctions and better performance, especially at extended ranges like 600 meters.

What are common mistakes when installing the M27 IAR buffer spring?

A frequent user error involves jamming the buffer spring into the buffer tube without twisting it. This can bind the spring, causing malfunctions and potentially turning the rifle into a manual action firearm.

Are Magpul PMAGs compatible with the M27 IAR?

Gen 2 PMAGs are not compatible due to the magwell angle. However, Gen 3 PMAGs and EMAGs do work with the M27 IAR/HK416 platform, following the USMC's eventual adoption of the Gen 3 PMAG.

Why are high-capacity magazines like Surefire 60-rounders not used with the M27 IAR?

Extended magazines are generally not utilized due to potential reliability issues, particularly in extreme temperatures and varied environments. The USMC prioritizes gear that functions consistently across all climates.

Related News

All News →

More Tactical & Gear Videos You Might Like

More from TFB TV

View all →