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

Published on July 7, 2016
Duration: 7:09

The Heckler & Koch HK4 is H&K's first pistol, notable for its ability to convert between four calibers: .380 ACP, .32 ACP, .25 ACP, and .22 LR. Designed in the mid-1960s and produced until the mid-1980s, approximately 40,000 units were made. The video details the technical process for converting between centerfire and rimfire cartridges, highlighting its similarities to the Mauser HSc.

Quick Summary

The Heckler & Koch HK4 is H&K's first pistol and is notable for its caliber convertibility, supporting .380 ACP, .32 ACP, .25 ACP, and .22 LR. The conversion process involves flipping the breech face and using specific barrels, sharing design traits with the Mauser HSc.

Chapters

  1. 00:00Introduction: H&K's First Pistol
  2. 01:01Shooting the HK4 in .32 ACP
  3. 02:11HK4 Conversion Kits and History
  4. 03:31Technical Conversion Process Explained
  5. 06:31Shooting .22 LR and Conclusion

Frequently Asked Questions

What makes the Heckler & Koch HK4 pistol unique?

The HK4 is unique because it was Heckler & Koch's first pistol and is designed to be caliber-convertible. It can be easily adapted to fire four different calibers: .380 ACP, .32 ACP, .25 ACP, and .22 Long Rifle, using specific conversion kits.

How does the HK4 convert between calibers?

The conversion process involves a technical step: removing the breech face with a specialized screwdriver and flipping it to align the firing pin correctly for either centerfire or rimfire ammunition. The .22 LR barrel is also fluted for easier extraction.

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

The HK4 was designed in the mid-1960s and produced until the mid-1980s. During its production run, approximately 40,000 units of the HK4 pistol were manufactured.

What other historical firearm does the HK4 resemble?

The HK4 shares significant design similarities with the Mauser HSc pistol. This influence is noticeable in its handling and overall aesthetic, reflecting common design trends of its era.

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