Why Are Open Bolts Illegal? Or Are They?

Published on March 18, 2025
Duration: 2:09

This video, presented by an expert firearms instructor, clarifies the legality of open-bolt firearms, using the KG-9 as an example. It explains the open-bolt firing mechanism and details the ATF's historical stance on these designs, noting that while new manufacturing of easily convertible open-bolt firearms is restricted, existing ones are not illegal. The instructor also touches on the historical appeal and simple mechanics of open-bolt designs.

Quick Summary

Existing open bolt firearms are not illegal. The ATF historically restricted new designs, deeming them 'too readily convertible' into machine guns. However, the KG-9 and similar historical firearms remain legal, and new designs could potentially be approved under current regulations.

Chapters

  1. 00:00Introduction to Open Bolt Firearms
  2. 00:30Open Bolt Firing Mechanism Explained
  3. 00:52ATF Ruling and Legality of Open Bolts
  4. 01:43Historical Context and Appeal of Open Bolts

Frequently Asked Questions

Are open bolt firearms illegal in the US?

Existing open bolt firearms are not illegal. However, the ATF has historically restricted the approval of new open bolt designs, deeming them 'too readily convertible' into machine guns. The legality of new designs can be subject to current administration policies and potential ATF re-evaluations.

How does an open bolt firearm work?

In an open bolt firearm, the bolt remains locked in the rearward position when cocked. When the trigger is pulled, the bolt moves forward, strips a round from the magazine, loads it into the chamber, and a fixed firing pin ignites the primer, causing the weapon to fire.

Why were open bolt designs restricted by the ATF?

The ATF's historical ruling against new open bolt designs was based on the assessment that they were 'too readily convertible' into machine guns. This classification led to a halt in their approval for new manufacturing in the US market.

What are some famous examples of open bolt firearms?

Iconic submachine guns that historically fired from an open bolt include the MAC-10, the Tech-9 (like the Intratec KG-9 shown), and the Uzi. These firearms are known for their simple operating mechanisms.

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