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

From: $89.99

Description

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. Ask us about discounts on an order of 2 or more.

Buy the base complete BCG from AO for $89.99, or upgrade it with our selection of parts for a little extra!

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
Manganese Phosphate 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

OPTIONAL CHOICES:

Choose an upgraded gas key and gas key screws, you can also choose a different firing pin and/or cam pin.

If you do not choose any additional parts, the BCG will be sent as is, if no assembly is selected the BCG will send as is, with the additional parts ordered.

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