Michael Heidler is researching military history and weapons technology for more than thirty years, especially the development of automatic weapons and their ammunition. Through intensive research in archives and museums, as well as through contacts to collectors around the world, he built up a comprehensive archive of military documents and regulations. He is also a longtime member of the German Association for Arms Technique and History. Over the years, he has written more than 100 specialist articles for arms magazines in various countries, including?Small Arms Review,?The Armourer, and?Visier. His best-known book is?German Secret Armament Codes until 1945, which has become the standard work on German manufacturer markings. He also wrote books on German rifle grenades and launchers, and on the Finnish Suomi M/31 submachine gun.

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