AO Precision True Mil-Spec SP/HPT/MPI 5.56 Bolt Carrier Group - $74.95

Description

Right here is a True Mil-Spec BCG. Each and every bolt, test fired from the factory. This unit is for builders who prefer tried and true manufacturing and aggressive quality assurance testing over fancy coatings, proprietary profiles and laser engraved logos. 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. You can now get these directly from AR15Discounts.com and save big!

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
Manganese 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
Hard Chrome Bore
Gas Key

Machined from 4130 chromoly steel alloy per ASTM A108/A322-13
Grade 8 Hardware
Properly Staked
Hard Chrome Internal
Permatex sealed