Milkor 37/38mm and 40mm Stopper

The Milkor 37/38mm Less Lethal "Stopper" Single-shot was designed and distributed in 1981 by Milkor (Pty) Ltd as a less-lethal anti-riot weapon along with the Milkor 40mm Single shot Grenade Launcher which was designed as a reduced-cost grenade launcher for the SWAPOL Forces. In 2008, Milkor (Pty) Ltd released a new design designated the Milkor 37/38mm or 40mm Stopper Convertible, which is a single shot break-open weapon designed to utilize a variety of 37/38mm or 40mm Less Lethal rounds.

Source: Wikipedia — Milkor 37/38mm and 40mm Stopper (CC BY-SA 4.0)