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

Published on January 3, 2018
Duration: 11:10

The USMC M27 IAR offers superior accuracy and reliability compared to the M16A4, with a free-floating barrel contributing to its performance. Common user errors with buffer springs can cause malfunctions, and the firing pin spring is not critical for function. While the RMR on the SDO is debated for CQB, the M27's STANAG magazine compatibility is a significant advantage over belt-fed systems, though certain polymer magazines like early PMAGs had compatibility issues.

Quick Summary

The M27 IAR offers superior accuracy and reliability over the M16A4 due to its free-floating, heavier barrel. Common user errors involve improper buffer spring installation. While it functions without a firing pin spring, compatibility issues exist with older PMAG generations.

Chapters

  1. 00:00Introduction: M27 IAR Series Part 2
  2. 00:14Accuracy and Reliability Advantages
  3. 01:06Common Buffer Spring Installation Errors
  4. 02:35Firing Pin Spring Functionality
  5. 03:14Optics: RMR vs. SDO for Close Quarters
  6. 04:12M27 Reliability with Blank Firing Adapters (BFAs)
  7. 04:47Magazine Capacity and Interoperability
  8. 05:58PMAG Compatibility Issues (Gen 2 vs. Gen 3)
  9. 07:04High Capacity Magazines: Reliability Concerns
  10. 09:35M27 Combat Performance and Portability

Frequently Asked Questions

What makes the M27 IAR more accurate than the M16A4?

The M27 IAR's superior accuracy stems from its free-floating, heavier barrel and a more modern system design. These features contribute to a more stable platform and reduced barrel harmonics compared to the M16A4, allowing for tighter shot groups.

What are common user errors with the M27 IAR's buffer spring?

A frequent mistake is jamming the buffer spring into the buffer tube without twisting it. This can bind the spring, hindering proper cycling and potentially causing the rifle to function like a bolt-action firearm.

Can the M27 IAR use standard AR-15 magazines?

Yes, the M27 IAR is designed to use standard STANAG magazines, which is a significant tactical advantage as it allows for interoperability with other rifles in the squad. However, early polymer magazines like Gen 2 PMAGs were found to be incompatible.

Does the M27 IAR require a firing pin spring to function?

No, the M27 IAR (and HK416) can function reliably without its firing pin spring. While its presence might help prevent extremely rare light primer strikes, the weapon operates correctly even if it's missing.

Related News

All News →

More Reviews Videos You Might Like

More from TFB TV

View all →