Whytep38,
This thread has gone away from your original question. I don't know after some looking what standards YHM holds their BCGs to. I will say this if you are looking for a bolt carrier group Yankee Hill sells them on their website for $123. It is not a full auto carrier and gives no description of metal or QC used:
http://yankeehillmachine.com/store/product542.html
If you are willing to spend only $17 more you can get this:
http://www.bravocompanyusa.com/BCM-B...0auto%20mp.htm
BCM® (MPI) complete bolt carrier group is fully assembled. Bolt carrier group (auto version) for your AR15, M16, or M4. Parkerized exterior and chrome lined inside carrier. Machined to USGI specifications. This M16/M4 carrier includes the proper Mil-Spec gas key. Gas key is chrome lined and heat treated per GI specifications. Gas key is secured to carrier via USGI domestic mfg Grade 8 fasteners and properly staked per Mil-Specs. These properly hardened parts insure a strong staking and proper gas system functioning. The bolt assembly is machined from the correct Mil-Spec Carpenter No. 158® steel, shot peened for increased strength, includes tool steel machined extractor and ejector, BCM Extractor Spring, and is HPT (High Pressure Tested) and MPI (Magnetic Particle Inspected).
Features Milspec Carpenter No. 158® steel HPT Bolt (High Pressure Tested/ Proof) MPI Bolt (Magnetic Particle Inspected) Shot Peened Bolt Chrome Lined Carrier (AUTO) Chrome Lined Gas Key Gas Key Hardened to USGI Specifications Grade 8 Hardened Fasteners Key Staked Per Mil-Spec Tool Steel Extractor BCM Extractor Spring Black Extractor Insert Mil-Spec Crane O-Ring
It says something to me that a company would say this up front. Not dissing on Yankee Hill but there is absolutely no description of what their BCG has had done to it. That extra $17 is nice for piece of mind. I realize this doesn't answer your question but the lack of information might be a clue. Good luck man.
-Jax



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