who produced the modern bolt-action sniper rifle  which Steyr SSG 04 was the basis of 
Steyr SSG 04:  It is also the basis for the Steyr SSG 08 and Steyr SSG Carbon. Steyr SSG 08: The Steyr SSG 08 (German: Scharfschützengewehr 2008, English: Sniper Rifle 08) is a modern bolt-action sniper rifle developed and produced by Steyr Mannlicher in Austria.
Steyr Mannlicher