Royal Armouries got firearms expert Jonathan Ferguson to talk about attaching a grenade launcer to the beloved Heckler & Koch MP5 SMG in this video... "Attaching a highly explosive attachment to a short range weapon may at first glance seem like a recipe for disaster. However, for certain applications having such a capability could be of real tactical use and indeed the ISTEC 200 series of launchers did see adoption with different nations during the last two decades of the twentieth century, including UK special forces."