Wiesel 20 mm Maschinenkanone (live fire) The MK 20 Rh 202 (short for MaschinenKanone 20 mm Rheinmetall) is an autocannon with a caliber of 20 mm designed and produced by Rheinmetall. The cannon is used on military vehicles of German origin, like the Marder infantry fighting vehicle, the Spähpanzer Luchs and some variants of the Wiesel AWC. It is also used in the Argentinian VCTP, an IFV based on the TAM chassis. German naval ships also employed Rh 202 mounts (usually two on frigates and destroye