Extending That Barrel to Avoid the NFA

Published on August 29, 2025
Duration: 1:52

This guide details how to legally extend a firearm's barrel length to meet NFA requirements using a permanent muzzle device attachment, often referred to as a 'pin and weld.' The video emphasizes accurate measurement techniques to ensure compliance with the 16-inch minimum barrel length for rifles. Instruction is provided by a knowledgeable source on firearm regulations and modification.

Quick Summary

To legally extend a rifle barrel to meet the NFA's 16-inch minimum, use the 'pin and weld' method. This permanently attaches a muzzle device, increasing the total barrel assembly length and avoiding Short-Barreled Rifle (SBR) classification and its associated tax stamp. Accurate measurement from muzzle to bolt face is crucial for compliance.

Chapters

  1. 00:00Identifying Pin and Weld Marks
  2. 00:07NFA and Barrel Length Regulations
  3. 00:44The Pin and Weld Workaround
  4. 01:23Measuring Barrel Length

Frequently Asked Questions

How can I legally make a rifle barrel longer than 16 inches without violating NFA rules?

You can achieve this by permanently attaching a muzzle device, such as a flash hider or compensator, to a shorter barrel. This 'pin and weld' method effectively increases the total barrel assembly length to 16 inches or more, thus avoiding Short-Barreled Rifle (SBR) classification under the NFA.

What is the minimum legal barrel length for a rifle in the US?

Under the National Firearms Act (NFA), a rifle must have a barrel length of at least 16 inches. Rifles with barrels shorter than this are classified as Short-Barreled Rifles (SBRs) and are subject to additional regulations and a tax stamp.

How do I accurately measure my rifle's barrel length for NFA compliance?

To accurately measure, close the bolt of the rifle. Then, insert a measuring rod from the muzzle end of the barrel all the way until it contacts the bolt face. The measurement from the muzzle to the bolt face is the true barrel length.

What is a 'pin and weld' and why is it used for barrel length?

A 'pin and weld' is a gunsmithing technique where a muzzle device is permanently attached to a barrel, often using a pin and then welding the device in place. This is commonly done to make a barrel assembly meet the NFA's 16-inch minimum length requirement for rifles, thereby avoiding SBR status.

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