DUSSELDORF, Germany, Jan. 11 (UPI) -- Germany's Rheinmetall and Austria's Steyr Mannlicher have partnered to manufacture and market a new and modular military assault rifle.
The RS556 -- 5.56x45 mm -- is based on Steyr Mannlicher's STM556, which Steyr Mannlicher first unveiled in 2012. It fires NATO's standard 5.56 mm rounds.