Cryptic Coatings Mystic Gold BCG 556

Free Shipping on all Cryptic Coatings Bolt Carrier Groups! 

Coated bolt carrier group (full auto version) for AR15, M16, or M4 machined from Mil-Spec 8620 aircraft quality steel with shrouded firing pin and Mil-Spec chrome lined interior. BCG includes the proper chrome lined and 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).

This is a 223/5.56/300 Blackout bolt carrier group.

This BCG will not work with 6.5/6.8/308 etc.

See also the popular Cryptic Coatings Mystic Black BCG and Cryptic Coatings Mystic Bronze BCG.

Cryptic products carry a Lifetime Warranty. 

• Mil-Spec BCG Machined from 8620 Aircraft Quality Steel and heat treated to 60-61 RC
• Mil-Spec Chrome Lined Carrier Interior
• Mil- Spec Chrome Lined 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.