The SAN 511, formerly OM 50 Nemesis, is a bolt-action sniper rifle made by Swiss manufacturer Swiss Arms (under license from AMSD).<br> It was created in early 2001 by Chris L. Movigliatti.<br> It fires the .50 BMG cartridge. It has a reported accuracy of 0.5 minute of arc (MOA) at and under 1 MOA at .