BOLT ASSEMBLY PHOSPHATE TEST FIRED

December 2, 2019 AR-15 Parts

E2 Armory bolt assemblies are precision machined from 9310 alloy. Fabricated from hardened steel, these groups are HP proof and MPI tested, designed to a high standard and manganese phosphated for a high-end finish you can rely on.

  • Bolt precision machined from 9310 alloy; carburized/case hardened & shot peened
  • 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
  • Ultrasonically cleaned and manganese phosphated – 2 hours accelerated Salt Spray & 48-hour endurance Salt Spray completed on each lot 
  • Markings laser engraved (HPT=High Pressure Tested, MPI=Magnetic Particle Inspection)
  • Extractor, machined 4140 Tool steel alloy, hardened with manganese phosphate
  • Extractor Pin, precision machined 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 Minimum
  • Gas Rings, Steel Corrosion Resistant Per AMS 5906 – X3
  • All material, components and packaging made in the USA
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