Andro Corp Gold AR-15 Bolt Carrier Group - G3 High Polish

• HP proof testing, 100%using a high pressure M197 or SAAMI commercial equivalent; without evidence of failure
• MPI testing after above, 100%inspection per ASTM E1444 using a standard 5 turn magnetizing coil with a current of 200 to 300 amperes; Circular and longitudinal continuous magnetization and a wet fluorescent solution shall be used. Conformance to MIL-STD-410 is required within ASTM E1444
• Bolt precision machined from 9310 alloy; carburized/case hardened & shot peened (PVD Coated)
• Gas Rings; Steel Corrosion Resistant Per AMS 5906 – X3
• Extractor; machined 4140 Tool steel alloy (PVD Coated)
• Precision machined Extractor Pin and ground AMS6440/52100 Bearing grade steel retaining pin
• Extractor Spring; 5 coil, 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
• Ejector; S7 shock resistant tool steel alloy, hardened, shot peened per ASTM B851/SAE AMS2430, manganese phosphate
• Ejector Spring; ASTM Grade A 228 wire stock; heat treated, stress relieved – Tensile Strength of 376,000 PSI
• Carrier machined from 8620 alloy, full auto profile, heat treated, ultrasonically cleaned, hard chrome bore (PVD Coated)
• Gas Key machined from 4130 chromoly steel alloy; heat treated, hard chrome internal (PVD Coated)
• Socket Cap Head Screw, steel, grade 4037 per ASTM; heat treated & manganese phosphate 2x
• 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
• Gas Key is installed with Permatex aviation gasket sealer; torqued to 55-foot pounds; pneumatically staked and break away tests performed to spec
• Cam Pin; precision machined 4340 chromoly steel alloy; heat treated (PVD Coated