Differences Between Cock on Open versus Cock on Close Actions | MidwayUSA Gunsmithing

Published on October 9, 2017
Duration: 1:40

Larry Potterfield, founder of MidwayUSA, provides an expert demonstration of the mechanical differences between 'cock on open' and 'cock on close' bolt actions. He uses Mauser 98 and Mauser 96 actions to illustrate how the mainspring is compressed during different phases of the bolt cycle, highlighting the historical prevalence of 'cock on close' in military rifles versus the modern 'cock on open' standard.

Quick Summary

The key difference between 'cock on open' and 'cock on close' bolt actions is when the mainspring is compressed. 'Cock on open' cocks the rifle during the bolt lift, common in modern rifles. 'Cock on close' cocks during the bolt's forward stroke and rotation, found in many historical military rifles like the Mauser 96, requiring more effort during closing.

Chapters

  1. 00:00Introduction to Cocking Mechanisms
  2. 00:23Cock on Open (Mauser 98)
  3. 00:49Cock on Close (Mauser 96)
  4. 01:18Summary and Conclusion

Frequently Asked Questions

What is the main difference between 'cock on open' and 'cock on close' bolt actions?

The primary difference lies in when the mainspring is compressed. 'Cock on open' cocks the rifle as the bolt is lifted, while 'cock on close' cocks it as the bolt is pushed forward and rotated down, requiring more effort during the closing stroke.

Which type of bolt action is more common in modern rifles?

Most modern bolt-action rifles utilize the 'cock on open' system. This design is generally preferred for its smoother bolt closing action after the initial lift.

Can you give an example of a rifle with a 'cock on close' action?

Historically, many military rifles featured a 'cock on close' action. The Mauser 96, demonstrated in the video, is an example of this type of mechanism.

How does the cocking mechanism affect the bolt cycle?

The cocking mechanism dictates where the primary resistance from the mainspring is felt. 'Cock on open' makes the bolt lift feel heavier, while 'cock on close' makes the bolt closing and rotation feel heavier.

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