The RMK 30 (Rückstoßfreie Maschinenkanone 30; recoilless autocannon) is a recoilless 30 mm caliber autocannon firing caseless 30 x 250 mm ammunition cartridges. The gun was developed by the German company Mauser, which is now a subsidiary of the Rheinmetall group. RMK 30 cannons have been proposed as upgrade for the Bundeswehr's (German armed forces) Tiger UHT attack helicopters. The UHT version currently lacks a gun, since the German Army was not happy with the recoil, accuracy and the range of the French GIAT 30 mm cannon which is fitted to other Tiger versions.