When Revolver Meets 1911: The Coonan .357 Magnum Automatic

Published on July 22, 2022
Duration: 16:10

The Coonan .357 Magnum Automatic is a unique 1911-style pistol engineered to reliably fire rimmed revolver cartridges like the .357 Magnum. Its design, originating from Dan Coonan's graduate project, overcomes the challenge of feeding rimmed rounds through an articulated magazine follower and a modified 1911 platform. Key differences from a standard 1911 include a longer ejection port, larger magazine well, pivoting trigger, and external extractor, with later models featuring a fixed cam barrel system.

Quick Summary

The Coonan .357 Magnum Automatic is a unique 1911-style semi-automatic pistol engineered to reliably feed rimmed revolver cartridges like the .357 Magnum. It achieves this through a specialized 7-round magazine featuring an articulated follower that manages cartridge rims, overcoming a significant design challenge.

Chapters

  1. 00:00Introduction: Coonan .357 Magnum Automatic
  2. 00:41Design Origins: Dan Coonan's Project
  3. 01:45Early Prototypes & Engineering Challenges
  4. 03:46Model Iterations & Company History
  5. 04:57Coonan vs. Standard 1911 Comparison
  6. 05:54Magazine Engineering: Articulated Follower
  7. 08:57Key Mechanical Differences from 1911
  8. 14:21Caliber Versatility: .38 Special Conversion

Frequently Asked Questions

What makes the Coonan .357 Magnum Automatic unique?

The Coonan .357 Magnum Automatic is unique because it's a 1911-style semi-automatic pistol specifically engineered to reliably fire rimmed revolver cartridges, such as the powerful .357 Magnum, which is a significant engineering challenge.

How does the Coonan pistol feed rimmed cartridges?

It utilizes a specially designed 7-round magazine with an articulated follower. This follower changes angle as it moves, preventing the cartridge rims from interfering with each other, thus enabling reliable feeding of rimmed rounds.

What are the main mechanical differences between a Coonan and a standard 1911?

Key differences include a longer ejection port, a larger magazine well, a pivoting trigger (instead of sliding), an external extractor for easier manufacturing, and a fixed cam barrel system on later models to handle the more powerful cartridge.

Can the Coonan .357 Magnum Automatic fire other calibers?

Yes, it can fire .38 Special cartridges for practice. This conversion requires swapping the standard red recoil spring (for .357 Magnum) with a lighter green spring provided by the factory.

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