Two Strange Project SPIW Magazines

Published on December 15, 2016
Duration: 8:52

This guide details the unique feeding mechanisms of two experimental SPIW program magazines: the Springfield 60-round dual-stack and the AAI XM19 50-round design. It highlights the complex follower systems and innovative constant-force springs used to achieve high capacities in compact designs, as explained by firearms expert Ian McCollum.

Quick Summary

The SPIW program featured innovative magazines like the Springfield 60-round dual-stack and the AAI XM19 50-round design. The AAI utilized unique constant-force metal coil springs for consistent feeding pressure, while the Springfield employed a complex dual-follower system. Both fired flechette projectiles at extremely high velocities, aiming to enhance infantry effectiveness.

Chapters

  1. 00:00Introduction to SPIW Program
  2. 01:31Springfield 1964 SPIW Magazine
  3. 03:39Springfield Magazine Mechanism
  4. 05:02AAI XM19 Magazine
  5. 06:24AAI Constant-Force Springs

Frequently Asked Questions

What were the key features of the Springfield SPIW magazine?

The 1964 Springfield SPIW magazine was designed for 60 rounds, utilizing a dual-stack configuration (two 30-round columns) to manage its length. It fired 10.3-grain flechettes at 4,400 fps and featured a complex feeding system where the rear column fed into the front column's lips.

How did the AAI XM19 magazine differ from the Springfield SPIW magazine?

The AAI XM19 magazine held 50 rounds and distinguished itself with an internal mechanism using constant-force metal coil springs. This design aimed for more consistent feeding pressure compared to traditional springs, addressing potential reliability issues in high-capacity designs.

What is a flechette projectile?

A flechette is a small, dart-like projectile, typically made of steel. In firearms like the SPIW, they were intended to offer high velocity and penetration, with the Springfield variant weighing 10.3 grains and achieving 4,400 fps.

Who is Ian McCollum and why is his assessment authoritative?

Ian McCollum, host of Forgotten Weapons, is a globally recognized expert in historical and prototype firearms. His authority stems from deep knowledge of obscure military programs, ability to explain complex mechanics, and access to rare artifacts.

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