The SIG Sauer SIG516 is a semi-automatic rifle manufactured by SIG Sauer. It is an AR-15 style rifle chambered in 5.56×45mm NATO. Introduced in 2010, the SIG516 was discontinued as of 2019. A variant chambered in 7.62x51mm NATO, the SIG716i, remains in production.

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  1. Weebs

    Trying to find a unicorn in the wild, Sig 516 or M400 lower receiver - Any ideas?

    I recently picked up a sig 516 upper and I’d like to put it on a 516 or m400 lower. Unfortunately they seem to be impossible to find. I made a WTB posting here and haven’t gotten any bites. I search gunbroker daily and I have active “notify me when it comes in stock” triggers on a couple sites...
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