• Machined from 8620 steel
  • Heavy-phosphate coated
  • Chrome-lined interior
  • Properly staked gas key with grade-8 screws
  • 9310 steel bolt — MIL-SPEC heat-treat and shot-peening

Full details and secure checkout: https://3crtactical.com/complete-bolt-carrier-group-5-56x45-for-m16-black-phosphate/?utm_source=armslist&utm_medium=referral&utm_campaign=listing