Description
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
