History of the M16A2 & What Did Stoner Think?

Published on December 24, 2021
Duration: 32:28

This video delves into the history and technical evolution of the M16A2 rifle, highlighting key design changes from its predecessor, the M16A1. It covers the rationale behind the 1:7 barrel twist for the SS109 round, the controversial 3-round burst, and the improved sights and furniture. The expert analysis also includes Eugene Stoner's critical perspective on some of the A2's modifications.

Quick Summary

The M16A2 rifle incorporated significant changes from the M16A1, including a 1:7 barrel twist for the M855 cartridge, a 3-round burst fire mode, an integrated case deflector, and more robust adjustable sights. Designer Eugene Stoner, however, was critical of some modifications, particularly the burst limiter and complex sights, believing they detracted from the rifle's original combat focus.

Chapters

  1. 00:00Introduction to the M16A2
  2. 01:12NATO Cartridge and Twist Rate
  3. 02:21Development and Key Personnel
  4. 04:02Furniture and Receiver Changes
  5. 05:00The 3-Round Burst Controversy
  6. 08:34Upper Receiver and Sights
  7. 12:28Handguards and Barrel Profile
  8. 14:39Muzzle Device and Accuracy Issues
  9. 18:51Production and Contracts
  10. 20:16Eugene Stoner's Assessment

Frequently Asked Questions

What were the key changes made to the M16A2 compared to the M16A1?

The M16A2 featured a faster 1:7 barrel twist for the M855 round, a 3-round burst fire mode, a case deflector ('Brunton Bump'), improved adjustable rear sights, a stronger buttstock, and a heavier barrel profile from the front sight forward.

Why was the barrel twist rate changed for the M16A2?

The M16A2's barrel twist rate was increased from 1:12 (M16A1) to 1:7 inches to better stabilize the heavier, longer 62-grain M855 NATO cartridge and the M856 tracer round, especially in cold weather.

What was Eugene Stoner's opinion on the M16A2's design changes?

Eugene Stoner expressed skepticism, calling the 3-round burst 'ridiculous' and noting the complex sights were driven by target shooters, not combat needs. He felt some weight additions compromised the original design's portability without enhancing combat effectiveness.

What issues were encountered with the M855 ammunition in the M16A2?

Early production M855 ammunition sometimes exhibited accuracy problems due to off-center steel penetrator cores. Refinements in manufacturing were necessary to ensure the ammunition met military standards for consistency and performance.

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