available in  5.56 NATO  ( .223 Remington ),  .243 Winchester ,  .376 Steyr  and  7mm-08 Remington . Walther WA 2000 The  WA 2000  is a  semi-automatic   bullpup   sniper rifle  that was produced by the  Carl Walther GmbH Sportwaffen  company. [1]  It was produced in three different calibers. [2]  Production