Steyr IWS 2000
The Steyr IWS 2000 is an Austrian semi-automatic anti-materiel rifle, produced by Steyr Mannlicher. IWS stands for Infantry Weapon System. It is actually a smoothbore, like many modern tank guns, not a true rifle.
The first design for the IWS2000 was called the Steyr AMR (Anti-Materiel Rifle), but was later changed to the IWS. It fires a 15.2 mm armor piercing fin stabilized discarding sabot round, and is the first man-portable rifle to use this type of ammunition.
Its unusual futuristic design influenced the conception of the Morretti SR4, a fictitious sniper rifle in the 2006 video game Battlefield 2142