How To Episode 8: Mosin Tight Bolt Fix

Published on July 11, 2013
Duration: 7:27

This video addresses the common issue of a tight bolt on Mosin Nagant rifles, particularly the M91/30 and Finn M39 variants. The primary cause identified is peened metal on the bolt face catching the cartridge rim. The solution involves carefully using a punch and hammer to flatten these burrs, followed by light filing for a smooth action. The process is demonstrated on a Finn M39 and tested with dummy rounds, showing a significantly improved bolt operation.

Quick Summary

A tight Mosin Nagant bolt is often caused by peened metal on the bolt face catching the cartridge rim. The fix involves using a punch and hammer to flatten these burrs, followed by light filing with a round file to smooth the edges for easier operation.

Chapters

  1. 00:00Intro: The Mosin Tight Bolt Problem
  2. 00:40Bolt Disassembly Steps
  3. 01:15Identifying the Cause: Peened Bolt Face
  4. 02:15The Fix: Punch & Hammer Method
  5. 03:25Refining Bolt Face with File
  6. 04:55Reassembly and Testing
  7. 05:55Gunsmithing Background

Frequently Asked Questions

What causes a Mosin Nagant bolt to be difficult to close?

The most common cause for a tight Mosin Nagant bolt is peened or rolled-over metal on the interior edges of the bolt face. This excess metal catches on the rim of the cartridge as it's being chambered, preventing smooth closure.

How can I fix a tight Mosin Nagant bolt myself?

You can fix a tight Mosin bolt by carefully using a punch and hammer to flatten the peened metal edges on the bolt face. Afterward, use a small round file to smooth these edges for easier cartridge feeding and bolt operation.

What tools are needed to repair a tight Mosin bolt?

Essential tools for fixing a tight Mosin bolt include a punch, a hammer, and a small round file. Dummy rounds are also recommended for safe testing after the repair is complete.

Is fixing a tight Mosin bolt a difficult gunsmithing task?

Fixing a tight Mosin bolt is considered an intermediate gunsmithing task. It requires careful application of force with a punch and hammer, and precise filing to avoid damaging the bolt face.

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