The HK4: H&K's First Pistol (Four Calibers, One Gun)

Published on July 7, 2016
Duration: 7:09

This guide details the process of converting the Heckler & Koch HK4 pistol between its supported calibers, including the critical step of flipping the breech face for rimfire ammunition. The video highlights the HK4's unique design, allowing for .380 ACP, .32 ACP, .25 ACP, and .22 LR. Expert instruction is provided on the technical conversion process.

Quick Summary

The Heckler & Koch HK4 is notable as H&K's first pistol, uniquely designed to fire four calibers: .380 ACP, .32 ACP, .25 ACP, and .22 LR. Conversion involves changing the barrel and flipping the breech face for rimfire compatibility. Produced from the mid-1960s to mid-1980s, around 40,000 were made, sharing design cues with the Mauser HSc.

Chapters

  1. 00:00Introduction and Shooting
  2. 01:01Shooting .32 ACP
  3. 02:11Conversion Kits and History
  4. 03:31Technical Conversion Process
  5. 06:31Shooting .22 LR and Conclusion

Frequently Asked Questions

What calibers can the Heckler & Koch HK4 pistol fire?

The Heckler & Koch HK4 is a unique pistol designed to fire four different calibers: .380 ACP, .32 ACP, .25 ACP, and .22 Long Rifle, achieved through a simple conversion process involving barrel and breech face changes.

How is the HK4 pistol converted between calibers?

Converting the HK4 involves removing the slide, then using a specialized screwdriver to flip the breech face, which repositions the firing pin for rimfire cartridges. A different barrel is also used for each caliber, with the .22 LR barrel being fluted for easier extraction.

When was the Heckler & Koch HK4 produced and how many were made?

The HK4 pistol was manufactured by Heckler & Koch from the mid-1960s until the mid-1980s. Approximately 40,000 units of the HK4 were produced during its production run.

What are the design similarities between the HK4 and the Mauser HSc?

The HK4 shares significant design similarities with the Mauser HSc pistol, particularly in its overall form factor and handling characteristics. This historical influence is evident in the HK4's ergonomics and operational layout.

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