How the Military Perfected the M4

Published on May 25, 2021
Duration: 24:37

This video details the M4A1 Block II, the standard for special operations until the URGI, highlighting its evolution from the M16. It covers the SOPMOD program's goals to enhance lethality and survivability, focusing on components like the Surefire SOCOM suppressor, Daniel Defense RIS II rail, and Geissele triggers. The review emphasizes the Block II's reliability improvements through specific barrel profiles, gas systems, and internal upgrades, making it a robust and accurate platform.

Quick Summary

The M4A1 Block II (SOPMOD Block II) was the standard for US special operations from around 2012. It addressed reliability issues from shorter carbine barrels by using a robust Daniel Defense RIS II Picatinny rail, a heavier SOCOM barrel profile for heat management and accuracy, and durable Surefire suppressors.

Chapters

  1. 00:00Introduction & Shooting Montage
  2. 01:41M4A1 Block II Overview & SOPMOD History
  3. 02:40Evolution from M16 to M4 Carbine
  4. 04:22SOPMOD Program Goals & QC Issues
  5. 06:26Suppressors & Muzzle Devices (Surefire, KAC)
  6. 09:06Barrel Profiles (SOCOM vs. Gov't) & Accuracy
  7. 11:58RIS II Rail System (Daniel Defense)
  8. 14:52Gas System & Internal Component Upgrades
  9. 18:30Triggers (Geissele) & Furniture (LMT)
  10. 19:40Optics Selection (Elcan, ACOG, EOTech)

Frequently Asked Questions

What made the M4A1 Block II the standard for special operations?

The M4A1 Block II, also known as SOPMOD Block II, became the standard for US special operations around 2012 due to its enhanced lethality and survivability. It incorporated upgrades addressing reliability issues from earlier carbine designs and featured robust components like the Daniel Defense RIS II rail and Surefire suppressors.

What were the main goals of the SOPMOD program for the M4?

The SOPMOD program aimed to significantly increase the lethality and survivability of the M4 carbine. Key objectives included improving weapon performance, enhancing target acquisition capabilities, reducing the weapon's signature, and refining fire control systems, while also addressing quality control issues.

Why is the Daniel Defense RIS II rail system significant for the M4A1 Block II?

The Daniel Defense RIS II is highly regarded for its exceptional rigidity and strength. Unlike some modern M-LOK rails, it's a full-length Picatinny system that ensures accessories, particularly IR devices, maintain their zero even after significant impacts or heavy use.

What are the advantages of the SOCOM barrel profile used on the M4A1 Block II?

The SOCOM barrel profile is heavier than the standard Government profile. This design helps manage the high heat generated during full-auto fire and provides superior harmonics, contributing to the rifle's potential for sub-MOA accuracy.

Related News

All News →

More Reviews Videos You Might Like

More from Garand Thumb

View all →