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

Published on October 9, 2017
Duration: 1:40

This video, presented by Larry Potterfield, founder of MidwayUSA, clearly explains the mechanical differences between 'cock on open' and 'cock on close' bolt action systems. He demonstrates how the Mauser 98 utilizes 'cock on open,' where the spring is compressed during bolt lift, while the Mauser 96 uses 'cock on close,' compressing the spring during the bolt's forward and downward closing motion. Understanding this distinction is key to appreciating the operational feel of different bolt-action rifles.

Quick Summary

The key difference between 'cock on open' and 'cock on close' bolt actions is when the mainspring is compressed. 'Cock on open' (e.g., Mauser 98) compresses the spring during bolt lift, while 'cock on close' (e.g., Mauser 96) compresses it during the bolt's forward closing motion.

Chapters

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

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. In 'cock on open' actions, the spring compresses as you lift and rotate the bolt handle upwards. In 'cock on close' actions, the spring compresses as you push the bolt handle forward and downwards to close the action.

Which Mauser rifle actions demonstrate 'cock on open' and 'cock on close'?

Larry Potterfield uses the Mauser 98 action to demonstrate the 'cock on open' mechanism, where the firing pin is cocked during the bolt lift. The Mauser 96 action is used to illustrate the 'cock on close' method, where cocking occurs during the bolt's forward closing stroke.

Why is understanding bolt action cocking important for a firearm owner?

Understanding cocking mechanisms helps explain the feel and effort required during bolt manipulation. It provides insight into the design philosophy of different rifle actions, particularly historical military rifles versus modern sporting rifles.

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