Extending That Barrel to Avoid the NFA

Published on August 29, 2025
Duration: 1:52

This video explains how to legally extend an AR-15 barrel to meet the 16-inch minimum required by the NFA using a permanently attached muzzle device. It details the pin and weld method as a workaround to avoid SBR classification and tax stamps. The correct procedure for measuring barrel length is demonstrated to ensure compliance.

Quick Summary

The National Firearms Act (NFA) requires rifles to have a minimum barrel length of 16 inches to avoid SBR classification. Permanently attaching a muzzle device using the 'pin and weld' method is a common way to achieve this legal length.

Chapters

  1. 00:00Identifying Pin and Weld Marks
  2. 00:07NFA Barrel Length Rules Explained
  3. 00:44The Pin and Weld Workaround
  4. 01:23How to Measure Barrel Length Correctly

Frequently Asked Questions

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

The National Firearms Act (NFA) mandates a minimum barrel length of 16 inches for rifles. Rifles with barrels shorter than this are classified as Short-Barreled Rifles (SBRs) and require special registration and a tax stamp.

How can I legally extend a rifle barrel shorter than 16 inches?

You can legally extend a shorter barrel to meet the 16-inch minimum by permanently attaching a muzzle device, such as a compensator or flash hider, using methods like 'pin and weld'.

What is the 'pin and weld' method for barrel extensions?

The 'pin and weld' method involves drilling a pin through the barrel and muzzle device, then welding them together. This permanently attaches the device, making the total barrel length measurement include it.

How do you correctly measure a rifle barrel for NFA compliance?

To measure correctly, ensure the bolt is closed. Insert a cleaning rod or measuring tool from the muzzle until it rests against the bolt face. Mark the rod at the muzzle and measure the exposed length; it must be 16 inches or more.

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