 Complete the following phrase:  Germany transferred its MP 18s to the German police forces after World War I. They also saw use in the hands of various paramilitary Freikorps during the aftermath of the German Revolution. In the 1920s a new, more reliable box magazine was developed for the MP 18 to replace the older snail-drum magazines. In 1928 a new version of the MP 18, the MP 28, saw the light of day, it featured the new box magazine as standard, a bayonet lug and a single shot mode. The MP 28 was manufactured in Belgium and Spain, and was widely exported from there, including to China and South America. Another variant based on the MP 18 was the MP 34 that was manufactured by the Germans through the Swiss front company Solothurn. The MP 34 was manufactured from the very best materials available and finished to the highest possible standard. Consequently, its production costs were extremely high. It was adopted by the Austrian police and army in the 1930s, and they were taken over by the Germans after 