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5.56 DuraBolt Black Nitride - Bolt Carrier Group

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0.73 LBS
$15.00 (Fixed shipping cost)

 Product Description

The F-1 Firearms DuraBolt Black Nitride direct impingement full auto rated M16/M4 bolt carrier group, for use in AR15 platforms, is compatible with MIL-SPEC receivers and associated components. The bolt carrier and bolt are ground after heat treat to ensure tolerances. The black nitride coating process brings hardness to near 70 Rockwell while maintining a premium finish.

  • Carpenter 158 bolt, ground after heat treat, MPI and HPT
  • 8620 steel carrier, ground after heat treat

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