M16 Bolt Assembly – Phosphate – HPT/MPI
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
(1) M16 Bolt Assembly – Phosphate – HPT/MPI
E2 Armory is committed to providing the highest quality firearm components that meet all rigorous military specifications while being competitively priced and rush delivered. Our customers are provided products that could be used for the defense of liberty and freedom across the globe. E2 Armory employs only the highest caliber employees that are devoted to continual improvement and bar setting quality. We are excellence.
E2: Distributing Freedom.