Centurion Arms C4 Bolt Carrier Group


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Centurion Arms C4 Bolt Carrier Group

The Centurion Arms C4 Bolt Carrier Group features an M16 profile and is full-auto tested to ensure a lifetime of reliability.

The bolt head is machined from Carpenter 158 steel and is magnetic particle inspected. The face of the bolt has been shot peened to disrupt the flat surface on a microscopic level to increase strength for dealing with the high pressures of 5.56 ammo. The tool steel extractor is made to withstand thousands and thousands of rounds without breaking. The internals of the carrier and gas key are chrome lined to prevent erosion of the steel from hot expanding gasses. The gas key is attached with grade 8 screws and staked to prevent them from walking out.


  • M16 profile
  • Full-Auto rated
  • Carpenter 158 bolt
  • Shot-peened
  • Magnetic particle inspected
  • Chrome-lined interior
  • Properly staked grade 8 gas key screws
  • Tool steel extractor
  • Phosphate coating

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