SAN 511

{{infobox weapon

| name = SAN 511 / OM 50 Nemesis

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| origin = Switzerland

| type = Bolt-action sniper rifle

| is_ranged = yes

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| manufacturer = Swiss Arms (formerly AMSD)

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| weight = {{convert|12|to|15|kg|abbr=on}}

| length = {{convert|1100|to|1500|mm|abbr=on}}

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| caliber = .50 BMG

| barrels = {{convert|380|to|810|mm|abbr=on}}

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The SAN 511, formerly OM 50 Nemesis,{{Cite web|url=http://www.amsd.ch/om50.html|title=-> AMSD - OM50|website=www.amsd.ch}} is a bolt-action sniper rifle made by Swiss manufacturer Swiss Arms (under license from AMSD).

It was created in early 2001 by Chris L. Movigliatti.

It fires the .50 BMG cartridge.{{Cite web|url=https://www.gunsandammo.com/content/www.gunsandammo.com|archive-url=https://archive.today/20130124222911/http://www.gunsandammo.com/content/nemesis-50-bmg|url-status=dead|title=Guns and Ammo|archive-date=January 24, 2013}} It has a reported accuracy of 0.5 minute of arc (MOA) at {{convert|300|m|abbr=on}} and under 1 MOA at {{convert|1000|m|abbr=on}}.{{webarchive|url=https://web.archive.org/web/20100725183510/http://world.guns.ru/sniper/sn76-e.htm | date=2010-07-25}}