HK51: The SAS' Full Auto Flashbang Dispenser
This video explores the HK51, a submachine gun variant of the G3/HK91 developed by Bill Fleming for potential British SAS and SBS use. Although not officially produced by Heckler & Koch, it saw limited operational adoption and found a niche in the US recreational market. The HK51 is characterized by its short 8.3-inch barrel and full-power 7.62mm NATO ammunition, making it a powerful, albeit loud, firearm. The video mentions its replacement by the more practical HK53 and highlights its role as an 'attention-getter' on the range.












