How Full Auto AK’s REALLY Work

Published on August 27, 2020
Duration: 21:28

This guide breaks down the complex mechanics of how full-auto AK-47 variants function, as explained by firearms expert Brandon Herrera. It details the critical modifications to the receiver, bolt carrier, and selector lever, emphasizing the role of the auto sear and safety sear in achieving automatic fire while preventing out-of-battery detonations. The information is presented for educational purposes by an FFL/SOT holder, highlighting legal compliance and the severe penalties for unauthorized modifications.

Quick Summary

Full-auto AK-47s function via specific modifications: a slotted receiver rail, a bolt carrier with a tripping tab, and an auto sear. The auto sear, often called the 'third pin,' works with the bolt carrier's tab to release the hammer automatically. It also acts as a safety sear, preventing out-of-battery detonations by ensuring the bolt is locked before firing.

Chapters

  1. 00:43Introduction & Legal Disclaimer
  2. 03:20Semi-Auto AK Mechanics Recap
  3. 06:10The Auto Sear (The Third Pin)
  4. 07:38Receiver Rail Modifications
  5. 09:13Bolt Carrier Modifications
  6. 10:16The Selector Lever Function
  7. 11:43The Safety Sear & Out-of-Battery Prevention

Frequently Asked Questions

How does a full-auto AK-47 differ mechanically from a semi-auto version?

A full-auto AK-47 requires specific modifications, including a slotted right-side receiver rail, a bolt carrier with a 'tab,' and a selector lever that blocks the disconnector. The crucial component is the auto sear, which enables automatic hammer release when tripped by the bolt carrier.

What is the function of the 'third pin' or auto sear in an AK-47?

The auto sear, often called the 'third pin,' is essential for full-auto function. It works in conjunction with a modified bolt carrier and receiver rail. When the bolt carrier cycles, its tab strikes the auto sear, releasing the hammer for automatic fire, and it also acts as a safety sear to prevent out-of-battery detonations.

Why is it illegal to convert a semi-auto AK to full-auto without proper licensing?

Converting a semi-auto firearm to full-auto without the appropriate Federal Firearms License (FFL) and Special Occupational Tax (SOT) status, and without registering the firearm under the National Firearms Act (NFA), is a serious federal crime with severe penalties, including lengthy imprisonment and substantial fines.

What role does the selector lever play in full-auto AK operation?

On a full-auto AK, the selector lever has a middle position for automatic fire. In this position, the selector physically prevents the disconnector from engaging the hammer, ensuring that the auto sear is the sole mechanism holding the hammer back until the bolt is fully closed and locked.

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