How to Measure Firing Pin Protrusion on a Bolt Action Rifle | MidwayUSA Gunsmithing

Published on October 9, 2017
Duration: 1:30

This guide details how to measure firing pin protrusion on a bolt action rifle, a critical step for ensuring firearm safety and reliability. Expert instructor Larry Potterfield demonstrates the use of a specialized gauge and digital calipers to accurately determine protrusion, emphasizing the importance of comparing the measurement against manufacturer specifications. Proper protrusion ensures reliable primer ignition without piercing the primer cup.

Quick Summary

Firing pin protrusion is the distance the firing pin extends past the bolt face when the rifle is fired. Proper protrusion is critical for reliable primer ignition and preventing primer piercing, ensuring both safety and function of the firearm. Measure it using a specialized gauge and digital calipers.

Chapters

  1. 00:00Introduction to Firing Pin Protrusion
  2. 00:26Preparing the Bolt for Measurement
  3. 00:40Using the Firing Pin Protrusion Gauge
  4. 00:55Calculating Firing Pin Protrusion
  5. 01:11Conclusion & Importance

Frequently Asked Questions

What is firing pin protrusion and why is it important?

Firing pin protrusion is the distance the firing pin extends past the bolt face when the rifle is fired. Proper protrusion is critical for reliable primer ignition and preventing primer piercing, ensuring both safety and function of the firearm.

What tools are needed to measure firing pin protrusion?

To measure firing pin protrusion, you will need a specialized firing pin protrusion gauge and a set of accurate digital calipers. The bolt must also be removed and decocked from the rifle.

How do you calculate firing pin protrusion?

Calculate firing pin protrusion by first measuring the base length of the protrusion gauge. Then, measure the total length with the firing pin engaged against the gauge's plunger. Subtract the base length from the total length to find the protrusion measurement.

What is a typical firing pin protrusion measurement?

While specific measurements vary by manufacturer, a common range for firing pin protrusion on bolt action rifles is between 0.050 and 0.070 inches. Always consult your rifle's manual for exact specifications.

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