Dirty Bird AR-15 5.56/.223/300BLK Bolt Carrier Group Phosphate/Chrome-Lined

Dirty Bird AR-15 5.56/.223/300BLK Bolt Carrier Group Phosphate/Chrome-Lined

The Dirty Bird AR-15 Bolt Carrier Group comes fully assembled and ready to be dropped in. The carrier body is machined from 8620 steel, heat treated, & MP inspected. The carrier's bore is hard chromed for increased corrosion resistance and reliability, per mil-spec. The bolt is machined from Carpenter 158 tool steel, shot peened to relieve stress, individually high-pressure tested and MP inspected. The bolt and carrier are both treated with a Mil-Spec phosphate coating for its durability and corrosion resistance. This Dirty Bird Phosphate Bolt Carrier Group features a gas key tube that is hard chromed and properly torqued and staked screws.

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
• Manganese 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

Gas Key

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

MADE IN THE USA!

Backed by the Dirty Bird Industries Lifetime Warranty!