AO Precision C158 SP/HPT/MPI 5.56 Black Nitride Bolt Carrier Group
AO Precision C158 SP/HPT/MPI 5.56 Black Nitride Bolt Carrier Group
AO Precision C158 SP/HPT/MPI 5.56 Black Nitride Bolt Carrier Group
AO Precision C158 SP/HPT/MPI 5.56 Black Nitride Bolt Carrier Group

AO Precision C158 SP/HPT/MPI 5.56 Black Nitride Bolt Carrier Group

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MSRP: $169.95
$119.95

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SKU: 5877 Categories: ,

 

 

AO Precision C158 SP/HPT/MPI 5.56 Black Nitride Bolt Carrier Group

AO Precision has provided BCGs to large military contractors such as FN America and large commercial retailers who re-brand and sell these at a considerable mark-up.

Bolt

  • Machined from Carpenter Technology No. 158 alloy.
  • Heat treated
  • Shot peened per ASTM B851/SAE AMS2430S
  • Individually High Pressure Tested (test fired)
  • HP proof testing, 100% using a high pressure M197 or SAAMI commercial equivalent, without evidence of failure
  • Individually Magnetic Particle Inspected after Initial Test Fire
  • Black Nitride Finish

Extractor

  • 4140 Steel per ASTM A108, cold drawn and stress relieved BHN 187-22
  • Phosphate Finish
  • Extractor Spring
  • Black Extractor Insert
  • Viton O-Ring

Carrier

  • Machined from AISI 8620 aircraft quality alloy per ASTM A108/A322-13
  • Full Mass M16 Profile
  • Stress Relieved
  • Black Nitride Finish

Gas Key

  • Machined from 4130 chromoly steel alloy per ASTM A108/A322-13
  • Grade 8 Hardware
  • Properly Staked
  • Hard Chrome Internal
  • Permatex sealed
Weight 13.1 oz
Dimensions 2 × 6 × 8 in
Bolt Material

Carpenter 158 Steel
Finish

Salt Bath Nitride
Cartridge Compatibility

.223/5.56 NATO/.300 BLK
Carrier Profile

M16
High Pressure Tested

Individually HP Tested
Magnetic Particle Inspected

Magnetic Partical Inspected
Platform

AR-15
Bolt Finish

Mag Phosphate

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