Coated bolt carrier group (full auto version) for AR15, M16, or M4 machined from Mil-Spec 8620 aircraft quality steel with shrouded firing pin. BCG includes heat treated gas key. Gas key is secured to carrier with Grade 8 fasteners and properly staked per Mil-Specs. This ensures a strong staking and proper gas system functioning. The bolt assembly is CNC machined from Mil-Spec Carpenter No. 158® steel and shot peened for increased strength per Mil-Spec; includes tool steel extractor with spring and viton O-ring; firing pin chromed finished with firing pin retaining pin and cam pin.
HPT (High Pressure Batch Tested) and MPI (Magnetic Particle Inspected).
Complete Mil-Spec M-16 Bolt Carrier with Bolt Assembly HPT/MPI Tested:
- Mil-Spec BCG Machined from 8620 Aircraft Quality Steel and heat treated to 60-61 RC
- Mil- Spec Gas Key
- Key Staked with Grade 8 Screws, per Mil-Spec
- Mil-Spec Carpenter 158® Bolt w/ Spring and Ejector
- Tool Steel Extractor w/ Spring and viton O-ring
- Mil-Spec Firing Pin w/ Chrome Finish
- Mil-Spec Cam Pin
- Full Auto Carrier (Backward compatible with all semi-auto rifles)
- BCG Weight – 11.55 oz.
Preston (verified owner) –
Amazing quality BCG and superb customer service. Will definitely be buying more. Buy with confidence.
Used this bolt carrier group for my primary duty rifle I built in 2016. I also have a PSA upper / BCG. I cringe when listening to that BCG slide since I am used to Cryptic Coatings BCG. My Cryptic Coatings bolt cracked at the cam pin hole and I discovered this yesterday while cleaning, it didn’t fail and shot fine last time I shot my rifle. Emailed them late last night telling them, due to the lifetime warranty, and had a reply before 11 am today. They offered to replace the bolt no questions asked. Didn’t even verify that it was their bolt, as the pictures I included didn’t show the carrier with their emblem. Due to the customer service I received today, I am ordering another BCG for my PSA rifle. The black nitride isn’t a top of the line finish, but the quality it has shown me and their customer service will make me continue to recommend and buy from Cryptic Coatings.