Andro Corp Gold AR-15 Bolt Carrier Group

• High Pressure Tested (HPT)
• Magnetic Particle Inspected (MPI)
• Carrier machined from 8620 alloy, full auto profile, heat treated, Grade 1 Polished Gold TiN Finish
• Gas Key machined from 4130 chromoly steel alloy, heat treated and Nitrided
• Bolt precision machined from 9310 alloy; carburized/case hardened, shot peened and Nitrided
• 4140 Tool steel Extractor alloy, hardened and Nitrided
• Extractor Pin, AMS6440/52100 Bearing grade steel retaining pin
• 5 coil, Extractor Spring, ASTM Grade A 228 wire stock, stress relieved, Tensile Strength of 393,000 PSI Max, 80 Durometer Per AMS-R-6855 black insert
• Extractor Spring O-Ring, Viton (FKM) Fluoropolymer Elastomer
• S7 shock resistant tool steel alloy Ejector, hardened, shot peened per ASTM B851/SAE AMS2430, manganese phosphate
• ASTM Grade A 228 wire stock Ejector Spring, heat treated, stress relieved – Tensile Strength of 376,000 PSI Minimum
• Gas Rings, Steel Corrosion Resistant Per AMS 5906 – X3
• Firing Pin, precision machined 8740 steel alloy, heat treated, precision ground & hard chrome plate
• Firing Pin Retaining Pin, carbon steel ASTM A510, heat treated & manganese phosphate
• Socket Cap Head Screw, steel, grade 4037 per ASTM, heat treated & manganese phosphate 2x
• Gas Key is installed with Permatex aviation gasket sealer, torqued to 55-foot pounds, pneumatically staked
• Cam Pin, precision machined 4340 chromoly steel alloy, heat treated and Nitrided