The M16A4; The 3 Round Burst Menace

Published on June 30, 2024
Duration: 31:54

Garand Thumb provides an expert-level assessment of the FN M16A4, highlighting its evolution from the M16A2 with features like a flat-top receiver and M5 RAS for optics. He critically examines the three-round burst mechanism's 'memory' flaw while appreciating the rifle's reliability, soft recoil, and the ballistic advantages of its 20-inch barrel, making it an iconic and effective combat platform.

Quick Summary

The M16A4, an evolution of the M16A2, features a 20-inch barrel for high muzzle velocity (over 3,000 FPS) and a flat-top receiver with the Knight's Armament M5 RAS for optics. While reliable and soft-shooting, its three-round burst mechanism has a 'memory' flaw causing unpredictable shot counts.

Chapters

  1. 00:00Introduction and Skit
  2. 01:33M16A4 Overview
  3. 03:21The Burst Mechanism Flaw
  4. 07:50Accuracy Testing
  5. 13:27Evolution from M16A2 to A4
  6. 17:09Ballistics and Barrel Length
  7. 20:09Rail Systems and Accessories
  8. 23:27Final Assessment

Frequently Asked Questions

What are the main drawbacks of the M16A4's three-round burst system?

The primary issue is the 'memory' of the burst cam. If a shooter releases the trigger mid-burst or switches to semi-auto, the next burst may fire only one or two rounds instead of the full three, leading to unpredictability in engagements.

How does the M16A4's 20-inch barrel affect its performance?

The 20-inch barrel provides superior muzzle velocity, exceeding 3,000 FPS. This allows standard 5.56 NATO ammunition to fragment more effectively and defeat armor at longer ranges compared to rifles with shorter barrels.

What key upgrades did the M16A4 introduce over the M16A2?

The M16A4 replaced the fixed carry handle with a flat-top receiver, enabling easier mounting of optics. It also incorporated the Knight's Armament M5 RAS rail system for increased accessory modularity.

Is the M16A4 considered a precision rifle?

No, the M16A4 is primarily a combat rifle. Accuracy testing showed group sizes between 1.7 and 4 MOA at 100 yards, which is typical for a service rifle, not a dedicated precision marksman platform.

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