Description
High Pressure Tested (HPT)
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Magnetic Particle Inspected (MPI)
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Carrier machined from 8620 alloy, full auto profile, heat treated, Nitrided
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Gas Key machined from 4130 chromoly steel alloy, heat treated and Nitrided
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Bolt precision machined from 9310 alloy; carburized/case hardened, shot peened and Nitrided
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4140 Tool steel Extractor alloy, hardened and Nitrided
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Extractor Pin, AMS6440/52100 Bearing grade steel retaining pin
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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
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Extractor Spring O-Ring, Viton (FKM) Fluoropolymer Elastomer
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S7 shock resistant tool steel alloy Ejector, hardened, shot peened per ASTM B851/SAE AMS2430, manganese phosphate
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ASTM Grade A 228 wire stock Ejector Spring, heat treated, stress relieved – Tensile Strength of 376,000 PSI Minimum
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Gas Rings, Steel Corrosion Resistant Per AMS 5906 – X3
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Firing Pin, precision machined 8740 steel alloy, heat treated, precision ground & hard chrome plate
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Firing Pin Retaining Pin, carbon steel ASTM A510, heat treated & manganese phosphate
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Socket Cap Head Screw, steel, grade 4037 per ASTM, heat treated & manganese phosphate 2x
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Gas Key is installed with Permatex aviation gasket sealer, torqued to 55-foot pounds, pneumatically steaked
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Cam Pin, precision machined 4340 chromoly steel alloy, heat treated and Nitrided
Additional information
| Weight | 5 oz |
|---|---|
| Dimensions | 6 × 4 × 2 in |
3 reviews for Mad Chemist BCG 5.56/.300blk | MPI, HPT Bolt Carrier Group
Only logged in customers who have purchased this product may leave a review.
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ajh6xd (verified owner) –
Best bag for your buck on a BCG
Robert Pittman (verified owner) –
definitely a solid BCG and a good price. Makes a great replacement or a spare. If you don’t have a spare… well… fix it.
Zach (verified owner) –
Sweet looking logo on a solid bcg.