https://midstatefirearms.com/product/458-socom-450-bushmaster-ar15-bcg-bolt-carrier-group-nickel/

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Complete Ar15 / m16 Bolt Carrier Group compatible with .458 Socom and .450 Bushmaster . Nickel boron Finish.  Drop into your 458/450 upper.

Features:

  • Nickel boron coated 8620 m16 Carrier
  • .458/450 Compatible Bolt face
  • MPI/HPT Tested, Shot Peened
  • Extractor
  • Ejector
  • Properly Staked Gas key with grade 8
  • Firing pin
  • Retaining pin
  • Lifetime Warranty & Made in USA