Cryptic Coatings 5.56 AR-15 Bolt Carrier Group - Phosphate

Full mil-spec construction in a manganese phosphate finish -- every spec verified before it ships. The Cryptic Coatings 5.56 BCG is a full-profile M16 bolt carrier group machined from 8620 aircraft-quality steel, with a Carpenter No. 158 bolt, HPT and MPI inspection, grade 8 staked gas key, and tool steel extractor.

Features:

• Manganese phosphate finish, 5.56 NATO
• Full-auto profile M16 carrier
• 8620 steel carrier, heat treated to 60-61 RC
• Chrome-lined carrier interior and gas key
• Carpenter No. 158 bolt, CNC machined, shot peened
• Grade 8 staked gas key
• Tool steel extractor, spring, Viton O-ring
• Shrouded, chromed firing pin
• High pressure tested and magnetic particle inspected
• 11.55 oz weight

Compatible with AR-15, M16, and M4 platforms in 5.56 NATO, .223 Rem, and .300 AAC Blackout. The full-auto profile carrier is backward compatible with all semi-automatic rifles, and the grade 8 gas key fasteners are properly staked per mil-spec to prevent the key from backing out under sustained rapid fire.

Founded in January 2014, Cryptic Coatings specializes in bolt carrier groups and BCG coatings, backed by a lifetime warranty. Their ever-expanding product line offers reduced friction, longer lifespans, and increased performance over standard finishes.