What the M16A2 Should Have Been

Published on November 16, 2022
Duration: 8:23

This guide details the construction of an M16A2 'What If' rifle build, focusing on component selection for improved ergonomics and reliability. It incorporates insights from an experienced builder, Russell Phagan, highlighting the use of a KE Arms KP-15 lower, a Windham Weaponry C7 upper, and a Brownells pencil barrel. The build aims to optimize the M16A2 platform for modern use while retaining historical elements.

Quick Summary

The M16A2 'What If' build incorporates a KE Arms KP-15 lower for its A1 length of pull, enhancing ergonomics, especially with body armor. It features a Windham Weaponry C7 upper, a Young Manufacturing Hard Chrome BCG, and a Brownells pencil barrel with a 1:7 twist for balanced performance. Reliability testing showed Magpul Gen 3 PMAGs outperformed USGI magazines during full-auto fire.

Chapters

  1. 00:00Introduction to the 'What If' M16A2 Build
  2. 00:48Upper Receiver and BCG Specs
  3. 01:27Handguards, Sights, and Barrel
  4. 02:25Fire Control and Full Auto Discussion
  5. 03:13Lower Receiver and Ergonomics
  6. 03:38Match Performance: Iron Sights
  7. 05:16Tactical Use of Full Auto
  8. 07:18Reliability and Magazine Testing

Frequently Asked Questions

What are the key components for an M16A2 'What If' rifle build?

A recommended build includes the KE Arms KP-15 polymer lower receiver for its A1 length of pull, a Windham Weaponry C7 upper receiver with an A1 carry handle, a Young Manufacturing Hard Chrome M16 BCG, and a Brownells military pencil barrel with a 1:7 twist rate.

Why is a pencil barrel preferred for this M16A2 build?

The pencil barrel offers a lighter profile and better balance than heavier government profiles, while the 1:7 twist rate is sufficient to stabilize common 5.56x45mm ammunition, making it a practical choice for a versatile build.

What magazine reliability issues were encountered, and what was the solution?

During full-auto fire testing, USGI magazines experienced slow-feeding malfunctions. The solution implemented was switching to Magpul Gen 3 PMAGs, which resolved these reliability issues.

What are the ergonomic advantages of the KE Arms KP-15 lower receiver?

The KE Arms KP-15 lower receiver features an A1 length of pull, which is more accommodating for a wider range of shooter sizes and offers improved comfort and control when wearing body armor compared to longer stocks.

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