Mosin-Nagant Factory Pressure Test Rifle

Published on November 20, 2018
Duration: 8:33

This video showcases a rare Mosin-Nagant rifle specifically designed for factory pressure testing using the Copper Units of Pressure (CUP) method. It details the specialized apparatus, including a drilled chamber and a piston-anvil system for compressing copper slugs. The discussion highlights the difference between CUP and PSI measurements and examines the rifle's historical markings and condition, emphasizing its unique value.

Quick Summary

A Mosin-Nagant factory pressure test rifle is a rare variant modified to measure chamber pressure using the Copper Units of Pressure (CUP) method. It features a device that compresses a copper slug upon firing, with CUP being a secondary measure of pressure's effect, not directly convertible to PSI.

Chapters

  1. 00:00Introduction: Unique Mosin-Nagant Pressure Test Rifle
  2. 00:30Measuring Pressure: The CUP Method Explained
  3. 01:08Pressure Testing Device: How it Works
  4. 02:26Slug Compression Mechanism
  5. 03:37CUP vs. PSI: Understanding the Difference
  6. 04:18Standard Firing Plug
  7. 05:25Rifle Markings and Condition
  8. 06:10Conclusion: Rarity and Auction Details

Frequently Asked Questions

What is a Mosin-Nagant factory pressure test rifle?

A Mosin-Nagant factory pressure test rifle is a rare variant specifically modified with a device to measure chamber pressure during firing, typically using the Copper Units of Pressure (CUP) method with copper slugs.

How was chamber pressure measured historically with CUP?

Historically, chamber pressure was measured using the Copper Units of Pressure (CUP) method. This involved placing a calibrated copper slug in a specialized device that would compress upon firing, with the degree of compression indicating the pressure.

Why can't CUP measurements be directly converted to PSI?

CUP is a secondary measurement reflecting the effect of pressure on copper, not a direct pressure reading like PSI. Therefore, there isn't a simple, universal conversion factor between the two units.

What makes the Mosin-Nagant pressure test rifle rare?

These rifles are rare because they were specialized factory tools, not standard issue. Finding one with its complete testing apparatus, original markings, and matching serial numbers, like the 1910 example shown, is exceptionally uncommon.

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