https://en.wikipedia.org/wiki/Milkor_MGL

The Milkor MGL (Multiple Grenade Launcher) is a lightweight 40 mm six-shot revolver-type grenade launcher (variations also fire 37/38mm) developed and manufactured in South Africa by Milkor (Pty) Ltd.The MGL was demonstrated as a concept to the South African Defence Force (SADF) in 1981. The operating principle was immediately …