To unlock the S0-14 in Modern Warfare 2, you need to progress the EBR-14 to Level 12. The EBR-14 is a marksman rifle rather than a battle rifle, and is the base gun for the Ordnance weapon platform.
Dieter Laser died twelve days after his 78th birthday on 29 February 2024. His death was not announced until a message to his official Facebook page was posted on 9 April 2024.