M79: The Iconic “Bloop Tube“ 40mm Grenade Launcher

Cool Forgotten Weapons merch! Combat experience with the bazooka rocket launcher in World War Two and its larger versions in the Korean War convinced the US military that a better weapon was needed to give front-line troops a direct-fire way to attack enemy strong points. The bazooka was bulky, not particularly accurate, and created a lot of backlist signature when fired. This led to a multi-part development effort involving design of a small grenade body, reliable but cheap fusing system, and a cartridge design that could launch it. The result was the 40x46mm grenade. It uses a “high-low“ system (originally developed by Rheinmetall during World War Two) in which a powder charge is fired in a small compartment within the cartridge case. The initial pressure in this compartment is some 35,000 psi, which is plenty high to e