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The SIGM400 is a family of firearms manufactured by SIG Sauer. The rifle is based on the earlier AR-15 rifle.

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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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