Faxon Q&A: Barrel Manufacturing, Nitride vs Chrome lining and more!

Published on March 5, 2017
Duration: 35:47

This video provides an in-depth look at modern firearm barrel manufacturing processes, focusing on the differences between Nitride (QPQ) and Chrome lining. Nathan from Faxon Firearms explains the metallurgical science behind these treatments, their impact on accuracy, corrosion resistance, and heat management. The discussion also covers various rifling methods and the critical importance of stress relief for thin-profile barrels.

Quick Summary

Faxon Firearms expert Nathan explains that Nitride (QPQ) barrel treatment diffuses nitrogen into the steel for superior corrosion resistance and accuracy potential, unlike chrome lining which plates a layer and can affect precision. Proper stress relief is vital for thin barrels to maintain accuracy under heat.

Chapters

  1. 00:00Introduction to Faxon Firearms Q&A
  2. 01:21Nitride vs. Chrome Lining Definitions
  3. 03:38History and Corrosion Resistance
  4. 06:52Military Adoption and Heat Management
  5. 11:15Lubricity and Wear Patterns
  6. 12:26Stellite Liners
  7. 14:09Nitride Processes: Gaseous vs. Salt Bath
  8. 19:17Stainless vs. Carbon Steel Barrels
  9. 21:13Rifling Methodologies
  10. 27:46Progressive Twist and Accuracy Standards
  11. 33:31Pencil Profiles and Stress Relief

Frequently Asked Questions

What is the main difference between Nitride and Chrome lining in firearm barrels?

Nitride (QPQ) is a surface treatment that diffuses nitrogen into the steel, enhancing hardness and corrosion resistance without adding thickness. Chrome lining is an electrolytic plating process that adds a separate layer, which can affect accuracy but offers good durability for sustained automatic fire.

Why is stress relief important for thin firearm barrels?

Thin barrels, like Faxon's pencil profiles, are susceptible to accuracy degradation due to residual stresses. Proper stress relief after rifling is crucial to prevent the barrel from 'walking' its point of aim as it heats up during firing.

Which barrel treatment is better for accuracy: Nitride or Chrome?

Generally, Nitride (QPQ) offers better accuracy potential because it doesn't introduce the bore diameter variations inherent in chrome plating. However, chrome lining excels in extreme heat scenarios common in sustained automatic fire.

What are the different methods of barrel rifling mentioned?

The video discusses Forged (Cold Hammer Forged/CHF), Cut (single-point or broach), and Button rifling. Faxon Firearms primarily utilizes the button rifling method.

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