How to Properly Measure Barrel Length Presented by Larry Potterfield | MidwayUSA Gunsmithing

Published on January 6, 2014
Duration: 3:43

This video provides a comprehensive guide to accurately measuring firearm barrel lengths, crucial for compliance with the National Firearms Act (NFA). Larry Potterfield demonstrates the official ATF procedure using a dowel rod, explaining the specific techniques for break-open shotguns, pump/semi-auto shotguns, rifles, revolvers, and semi-auto pistols. Understanding these precise measurement points ensures legal compliance and proper firearm identification.

Quick Summary

The official ATF procedure for measuring firearm barrel length involves using a dowel rod slid down the bore until it touches the breech face. Mark the rod at the muzzle, remove it, and measure the marked portion. For repeating shotguns, measure to the face of the closed bolt.

Chapters

  1. 00:00Introduction & NFA Regulations
  2. 00:36Measuring Break-Open Shotguns
  3. 01:36Measuring Pump & Semi-Auto Shotguns
  4. 02:41Measuring Rifles
  5. 03:16Measuring Handguns

Frequently Asked Questions

What are the minimum legal barrel lengths for rifles and shotguns in the US?

According to the National Firearms Act of 1934, rifles must have a barrel length exceeding 16 inches, and shotguns must have a barrel length exceeding 18 inches to avoid federal registration and taxes.

How do you properly measure the barrel length of a shotgun?

For break-open shotguns, slide a dowel rod down the bore to the breech face, mark it, and measure. For pump and semi-auto shotguns, measure from the muzzle to the face of the closed bolt.

What is the ATF-approved method for measuring firearm barrel length?

The ATF method uses a dowel rod inserted down the bore until it touches the breech face. Mark the rod at the muzzle, remove it, and measure from the mark to the end of the rod.

How are handgun barrel lengths measured?

Revolvers are measured from the muzzle to the face of the cylinder. Semi-automatic pistols are measured from the muzzle to the breech face.

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