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Gold Polished Titanium Nitride Hard Coat; Assist in lubricity and combats friction.


  • 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

AR15 TiN NITRIDE BCG, Gold polish is 100% made in the U.S.A and is back by ACI’s Lifetime Warranty.





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