HK51: The SAS' Full Auto Flashbang Dispenser

Published on October 22, 2021
Duration: 7:30

The HK51, a compact 7.62 NATO weapon, was developed by Bill Fleming for British SAS/SBS, not as an official H&K factory model. Originally designated MC51 by the British, it was later phased out for the HK53. In the US, Fleming converted HK91 rifles into full-auto HK51s, making them highly sought-after collector items due to their compact size and powerful caliber, despite a significant muzzle blast.

Quick Summary

The HK51 is a compact 7.62 NATO weapon, often a conversion of an HK91 rifle. Developed by Bill Fleming for British SAS/SBS, it's known for its significant muzzle blast, earning it the nickname 'automatic flashbang dispenser'. US civilian models with transferable auto sears are highly sought-after collector items.

Chapters

  1. 00:00Introduction: HK51 'Flashbang Dispenser'
  2. 00:30H&K Nomenclature Explained
  3. 01:10Origins: British SAS/SBS Request
  4. 02:06Service History: MC51 vs HK53
  5. 03:03US Civilian Market & Conversions
  6. 03:52Physical Features & Modularity
  7. 04:39Receiver Markings & Conversions
  8. 05:57Operation & Conclusion

Frequently Asked Questions

What is the HK51 and who originally developed it?

The HK51 is a compact 7.62 NATO caliber weapon, often a conversion of an HK91 rifle. It was developed by American gunsmith Bill Fleming, initially for British SAS and SBS special operations units, not as an official Heckler & Koch factory model.

Why was the HK51 nicknamed the 'automatic flashbang dispenser'?

The HK51 earned the nickname 'automatic flashbang dispenser' due to its significant muzzle blast and concussion, a result of firing a full-power 7.62 NATO round from a very short barrel, creating a dramatic visual and auditory effect.

What is the significance of the HK51 in the US civilian market?

In the US, HK51s are highly sought-after collector items, particularly those converted by Bill Fleming that feature transferable auto sears, allowing for legal full-auto fire. Most are converted from semi-automatic HK91 rifles.

What caliber does the HK51 fire and what are its key features?

The HK51 fires the 7.62x51mm NATO cartridge. Key features include its compact size, an MP5-style handguard, an HK91-style collapsing stock, and the ability to accept standard H&K buttstocks and fire control groups.

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