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Some information courtesy of SEI, Different and myself.
Chinese M14 bolts are hardened clear through to 44 to 47 HRC. They lack the hard surface of USGI bolts that are case hardened. Chinese M14 bolts are made of a steel that doesn't take case hardening, 4135 alloy steel. USGI M14 bolts are made of 8620 steel. Other issues with the factory Chinese M14 bolt is that the locking lugs are narrow and lug contact with the receiver is not always what you would want. NOTE: All of my custom M14s are built on Chinese receivers with TRW bolts. As for the FCG, I had SEI perform their M14/M21A5 C-IED 4.5 lb MAX-PAK Trigger Upgrade on a pair of Chinese FCGs and they are just as good as the pair of USGI TRW FCGs with SEIs MAX-PAK.
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