The RS556 is a modular assault rifle designed by the Austrian Company Steyr Mannlicher based on the STM556. the development of the STM 556 has started in 2012 and manufactured since May 2016. In January 2017, German Company Rheinmetall and Steyr Mannlicher, have joined their forces to manufacture and market the RS556 modular assault rifle. Rheinmetall and Steyr Mannlicher are offering the RS556 assault rifle as a jointly produced product, made in Germany, with a German valued added share of 60%. It is a possible candidate for the new “System Sturmgewehr Bundeswehr”: the German armed forces intend to replace their standard G36 assault rifle with a more advanced system starting in 2019.