HK51: The SAS' Full Auto Flashbang Dispenser

Published on October 22, 2021
Duration: 7:30

This guide covers the operational aspects and conversion background of the HK51, a rare Heckler & Koch variant. Expert Ian McCollum details its origins with British special forces and its subsequent civilian market availability in the US, often as a full-auto conversion. The HK51 is characterized by its compact size, 7.62 NATO caliber, and unique history as a 'flashbang dispenser.'

Quick Summary

The HK51 is a rare Heckler & Koch variant, often a conversion of an HK91 receiver, chambered in 7.62x51mm NATO. It's humorously called a 'flashbang dispenser' due to its massive muzzle blast and intense flash signature from its short barrel and powerful cartridge. It was developed for British special forces but is now a sought-after collector item, often in full-auto configuration.

Chapters

  1. 00:00Introduction to the HK51
  2. 00:30H&K Nomenclature System
  3. 01:10Origins and British Special Forces
  4. 02:06Service History (MC51)
  5. 03:03American Civilian Market
  6. 03:52Physical Features and Modularity
  7. 04:39Receiver Markings
  8. 05:57Operation and Conclusion

Frequently Asked Questions

What is the HK51 and why is it called a 'flashbang dispenser'?

The HK51 is a rare Heckler & Koch variant, often a conversion of an HK91 receiver, chambered in 7.62x51mm NATO. It's humorously called a 'flashbang dispenser' due to its massive muzzle blast and intense flash signature from its short barrel and powerful cartridge.

Who originally requested the HK51, and what was its intended purpose?

The HK51 originated from a request by British special forces (SAS/SBS) for a compact, full-power 7.62 NATO weapon. It was intended for specialized maritime and counter-terror operations where its size and firepower were advantageous.

Is the HK51 an official Heckler & Koch factory model?

No, the HK51 is generally not an official factory production model from Heckler & Koch. Most examples are conversions, often performed by American gunsmiths like Bill Fleming, typically from HK91 semi-automatic receivers.

What caliber does the HK51 fire, and what are its typical magazine capacities?

The HK51 fires the 7.62x51mm NATO (.308 Winchester) cartridge. It typically uses standard 20-round G3 magazines, which are also compatible with the HK91 and other related H&K roller-delayed blowback firearms.

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