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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 - 16" .300 BLK
    Sig Sauer MCX AR15 Conversion Kit - 16" .300 BLK Learn More
  3. Sig Sauer MCX AR15 Conversion Kit - 16" 5.56mm NATO
    Sig Sauer MCX AR15 Conversion Kit - 16" 5.56mm NATO Learn More
  4. Sig Sauer MCX Rattler AR15 Conversion Kit - 5.5" .300 Blackout
    Sig Sauer MCX Rattler AR15 Conversion Kit - 5.5" .300 Blackout Learn More
  5. Sig Sauer MCX Upper Receiver Assembly (Gray)
    Sig Sauer MCX Upper Receiver Assembly (Gray) Learn More
  6. Sig 516 Upper Assembly, 5.56mm, 10
    All upper assemblies are shipped with a recoil buffer and action spring. These components must be installed to ensure proper function of the SIG516 upper assembly on your AR-type lower receiver. Learn More
  7. Sig 516 Upper Assembly, 5.56mm, 7
    The SIG516 uppers allow operators to upgrade their current AR-15/M16/M4-type rifles from direct gas impingement systems to the SIG SAUER® advanced short-stroke pushrod system. Learn More
  8. Sig Sauer 516 Gen2 16" Full-Auto Upper Receiver
    Sig Sauer 516 Gen2 Upper Receiver, 5.56mm NATO, 16" BBL, Full Auto Capable Learn More
  9. Sig 516 Upper Assembly, 5.56mm, 14.5
    Sig Sauer 516 Gen2 Complete Upper Receiver, 5.56mm NATO, 14.5" BBL - NFA Rules Apply Learn More
  10. Sig 516 Upper Assembly, 5.56mm, 16
    The SIG516 uppers allow operators to upgrade their current AR-15/M16/M4-type rifles from direct gas impingement systems to the SIG SAUER® advanced short-stroke pushrod system. Learn More

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