Sticky Mosin Bolt? Here's how to "Make your Mosin Rock"

Published on February 24, 2012
Duration: 12:43

This video provides a comprehensive guide to fixing a sticky Mosin-Nagant bolt, a common issue often caused by dried cosmoline. It details methods for polishing the chamber and firing pin, lightening the firing pin spring, and smoothing critical contact points. The tutorial also covers extractor adjustment and recommends specific lubricants like Ballistol and Loctite C5-A for improved operation and accuracy through tang bedding.

Quick Summary

A sticky Mosin-Nagant bolt is often caused by dried cosmoline residue in the chamber. Fix it by polishing the chamber with JB Bore Compound and a drill, smoothing the firing pin, and applying lubricants like Ballistol or Loctite C5-A to friction points.

Chapters

  1. 00:00Introduction: Sticky Mosin Bolt Fix
  2. 00:35Tools & Materials for Mosin Repair
  3. 01:55Common Causes of Sticky Bolts
  4. 03:21Chamber Polishing Technique
  5. 05:38Polishing the Firing Pin
  6. 07:36Lightening the Firing Pin Spring
  7. 08:25Smoothing Bolt Contact Points
  8. 08:58Adjusting the Extractor
  9. 09:34Recommended Lubricants
  10. 10:44Tang Bedding for Accuracy
  11. 11:58Final Testing & Results

Frequently Asked Questions

What are the common causes of a sticky Mosin-Nagant bolt?

A sticky Mosin-Nagant bolt is typically caused by dried cosmoline residue in the chamber that forms a varnish-like substance. Less commonly, excessive headspace can also lead to a sticky bolt issue, requiring careful inspection and potential gunsmithing.

How can I polish the chamber of my Mosin-Nagant to fix a sticky bolt?

You can polish the chamber using a drill fitted with a bore brush and a cleaning compound like JB Non-embedding Bore Compound. This process effectively removes old cosmoline and smooths the chamber surface, facilitating easier cartridge extraction and smoother bolt operation.

What lubricants are recommended for a Mosin-Nagant bolt?

For general cleaning and lubrication, Ballistol is recommended. For high-friction areas on the bolt assembly, Loctite C5-A copper-based anti-seize lubricant is suggested for its long-lasting smoothness and protection.

Can modifying the firing pin spring improve Mosin bolt action?

Yes, lightening the firing pin spring can reduce the force required to cycle the bolt. This can be done by carefully cutting a coil or grinding the spring's diameter, but care must be taken not to cause light primer strikes.

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