Sig Sauer

MCX Virtus | 300 BLK | 9" Upper

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$200 minimum order amount required for Sezzle


$200 minimum order amount required for Sezzle


Convert any MIL-SPEC AR Lower into a MCX Rattler. Complete with upper assembly, lower receiver stock adapter kit, side folding AR buffer tube knuckler, and match duo trigger kit.


300 BLK
barrel length
Match Duo

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  • 5
    MCX VIRTUS | 300 BLK | 9" UPPER

    Posted by ALLEN on Jan 2nd 2023

    My first 300 Blackout and I am SUPER HAPPY with the purchase because I already have a MCX Virtus 11.5" 556. So all I had to do was change the upper if I wanted to shoot the 300 BLK. The price was the cheapest that I found after tax and shipping. If there was a MCX Virtus 300 BLK 6.5 Upper, I would buy that as well.