The SAN 511, formerly OM 50 Nemesis, is a bolt actionsniper rifle made by Swiss manufacturer Swiss Arms (formerly AMSD). It was created in early 21st century. It fires the .50 BMG cartridge. It is a derivative of the French sniper rifle Hecate II made by the manufacturer PGM. It is extremely powerful and lethal, capable of destroying windows up to 2.5 km (1.6 mi).