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 reliable ignition and preventing primer piercing. The process, demonstrated by Larry Potterfield of MidwayUSA, involves using a specialized gauge and digital calipers to obtain precise measurements. Proper protrusion is essential for safe and effective firearm function.

Quick Summary

Measuring firing pin protrusion on a bolt action rifle involves using a specialized gauge and digital calipers. First, decock the bolt and place the gauge against the bolt face. Measure the gauge's base length, then measure the total length with the firing pin engaged. Subtracting the base length from the total length gives you the protrusion measurement, crucial for reliable ignition and safety.

Chapters

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

Frequently Asked Questions

What is firing pin protrusion and why is it important?

Firing pin protrusion is the distance the firing pin extends beyond the bolt face when forward. It's critical for reliable ignition, ensuring the primer is struck with enough force to ignite the powder without piercing the primer cup, which is vital for safety and function.

What tools are needed to measure firing pin protrusion?

To accurately measure firing pin protrusion, you will need a specialized firing pin protrusion gauge designed for your bolt action rifle and a set of precise digital calipers. A clean work surface is also recommended.

How do you calculate firing pin protrusion?

To calculate firing pin protrusion, first measure the base length of the protrusion gauge with calipers. Then, measure the total length with the firing pin engaged. 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 and rifle model, a common range for firing pin protrusion is between 0.050 and 0.070 inches. Always consult your rifle's manual for exact specifications.

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