AO Precision C158 SP/HPT/MPI 5.56 Bolt Carrier Group – Black Nitride - 00-BCG-M16MP-N

Right here is a True Mil-Spec BCG. 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.

Bolt

• Machined from Carpenter Technology No. 158 alloy.
• Heat treated
• Shot peened per ASTM B851/SAE AMS2430S
• Individually High Pressure Tested (test fired)
• Individually Magnetic Particle Inspected
• Manganese Phosphate Finish

Extractor

• Tool Steel Extractor
• Black Nitride Phosphate Finish
• Mil-Spec O-Ring

Carrier

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

Gas Key

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

Like all NBS parts, this unit is backed by a lifetime warranty.