How to Episode 7: Common Milsurp Bolt Disassembly

Published on June 13, 2013
Duration: 18:43

This guide details the disassembly and reassembly of three common military surplus bolt actions: the Mosin-Nagant, Karabiner 98k, and K31. It covers specific steps for each bolt, including removing the firing pin, bolt head, and springs. The guide also emphasizes critical safety checks, such as verifying firing pin protrusion on the Mosin-Nagant and correctly engaging the safety on the Karabiner 98k during reassembly. Expert instruction is provided on maintaining these classic firearms.

Quick Summary

Disassembling common milsurp bolts like the Mosin-Nagant, Karabiner 98k, and K31 involves specific steps for each. For the Mosin, remove the bolt head and thread off the cocking piece after compressing the firing pin. The K98k requires the safety in the middle position, then compressing and rotating the cocking piece. The K31 disassembles by disengaging the firing pin/safety, removing the charging handle, and separating the sleeve from the bolt body.

Chapters

  1. 00:01Introduction to Milsurp Bolt Disassembly
  2. 00:36Mosin-Nagant Bolt Disassembly
  3. 01:33Mosin-Nagant Bolt Reassembly and Firing Pin Protrusion Check
  4. 05:03Karabiner 98k Bolt Disassembly
  5. 07:58Karabiner 98k Bolt Reassembly
  6. 10:42Fixing a Decocked Karabiner 98k Bolt
  7. 12:19K31 Bolt Disassembly
  8. 14:49K31 Bolt Reassembly
  9. 16:12Bonus: Arisaka Bolt Disassembly
  10. 17:22Conclusion and Future Videos

Frequently Asked Questions

How do you disassemble a Mosin-Nagant bolt?

To disassemble a Mosin-Nagant bolt, remove the bolt head, then compress the firing pin spring by pushing the pin against a soft surface. While compressed, thread the cocking piece off the rear of the firing pin. This separates the main components for cleaning.

What is the correct firing pin protrusion for a Mosin-Nagant?

The correct firing pin protrusion for a Mosin-Nagant bolt should be between .075 and .095 inches. This measurement is critical to prevent pierced primers and gas blowback, ensuring safe operation.

How do you reassemble a Karabiner 98k bolt safely?

When reassembling a Karabiner 98k bolt, it's crucial to rotate the safety lever back to the 'safe' position while the bolt assembly is compressed. Failing to do so can result in the bolt closing in the 'fired' position, making it difficult to correct.

What is unique about the K31 bolt's lubrication?

The K31 bolt is designed for cold weather and uses a specific grease-like lubricant called Waffen mint oil. For maintenance, it's recommended to use a light grease or LSA that stays in place, rather than a very light oil.

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