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  1. Sig Sauer M400 / AR15 Stripped Upper Receiver
    Sig Sauer M400 / AR15 Stripped Upper Receiver Learn More
  2. Sig Sauer MCX AR15 Conversion Kit - 11.5" 5.56mm NATO
    Sig Sauer MCX AR15 Conversion Kit - 11.5" 5.56mm NATO Learn More
  3. Sig Sauer MCX AR15 Conversion Kit - 16" .300 BLK
    Sig Sauer MCX AR15 Conversion Kit - 16" .300 BLK Learn More
  4. Sig Sauer MCX AR15 Conversion Kit - 16" 5.56mm NATO
    Sig Sauer MCX AR15 Conversion Kit - 16" 5.56mm NATO Learn More
  5. Sig Sauer MCX Rattler AR15 Conversion Kit - 5.5" .300 Blackout
    Sig Sauer MCX Rattler AR15 Conversion Kit - 5.5" .300 Blackout Learn More
  6. Sig Sauer MCX Rattler AR15 Conversion Kit - 5.5" 5.56mm NATO
    Sig Sauer MCX Rattler AR15 Conversion Kit - 5.5" 5.56mm NATO Learn More
  7. Sig Sauer MCX Upper Receiver - 16" 5.56mm NATO
    Sig Sauer MCX Upper Receiver - 16" 5.56mm NATO Learn More
  8. Sig Sauer MCX Upper Receiver Assembly (Gray)
    Sig Sauer MCX Upper Receiver Assembly (Gray) Learn More

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Upgrade your rifle with a new M400, 516, or MCX Upper Receiver!