Disproving the myth that a 7” launcher cannot activate a M433 HEDP round. Incorrectly say 9” in vid

Published on September 15, 2025
Duration: 2:54

This video demonstrates the capability of a 9-inch 40mm grenade launcher to successfully activate an M433 HEDP (High Explosive Dual Purpose) round. The instructor from Washington County Machine Guns LLC conducts three live-fire tests, confirming that the shorter barrel length does not impede the round's functionality. The demonstration includes proper loading and firing techniques for this type of ordnance.

Quick Summary

A 9-inch 40mm grenade launcher is capable of activating an M433 HEDP round, debunking a common myth. The demonstration by Washington County Machine Guns LLC shows proper loading and firing techniques, emphasizing safety and the round's functionality.

Chapters

  1. 00:00Introduction and Test Setup
  2. 00:13Dispelling the Myth
  3. 00:23M433 HEDP Round Presentation
  4. 00:33First Shot Demonstration
  5. 00:59Loading and Firing Technique
  6. 01:38Second Shot
  7. 02:06Third Shot and Conclusion
  8. 02:13M433 HEDP Details
  9. 02:40Test Results and Confirmation

Frequently Asked Questions

Can a 9-inch 40mm grenade launcher fire an M433 HEDP round?

Yes, a 9-inch 40mm grenade launcher can successfully activate an M433 HEDP (High Explosive Dual Purpose) round. This video from Washington County Machine Guns LLC demonstrates through live-fire tests that the shorter barrel length does not prevent the round from functioning as intended.

What is an M433 HEDP round?

The M433 HEDP is a 40mm grenade designed for High Explosive Dual Purpose use. This means it is engineered to provide both anti-personnel effects (fragmentation) and anti-materiel effects (penetration or damage to equipment and structures).

What is the proper technique for firing a 40mm grenade launcher?

When firing a 40mm grenade launcher, it's crucial to maintain a firm grip and a stable stance. Aim with a noticeable upward angle, keep your finger off the trigger until ready, and ensure your hands are clear of the breech when closing it. The recoil is significant, similar to a powerful shotgun.

Are there any regulatory requirements for firing 40mm grenades?

Yes, for certain types of ordnance, including potentially the destruction of M433 HEDP rounds, there are regulatory requirements. In this video, the speaker mentions needing to notify the ATF after destroying one round, indicating federal oversight for such activities.

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