Don't really know.
What I do know is that none of the BCM bolt's I have in stock say CM.
C4
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Stag Arms reply regarding their (Stag/YHM) bolts:
"Our bolts are made from carpenter 158. The bolt carriers are made from 8620 steel. The gas keys are staked into place. Our bolts are batch tested for HPT and MPI. If you would like one specifically tested it is an additional $5.00. If you have any further questions please contact us again.
David
Stag Arms
860-229-9994"
At least they have an option to get the specific bolt you intend to buy tested if you so desire/pay extra...
I've got two CM-marked BCM completes I bought in mid-2009. I remember seeing an explanation posted by them on here or ar15.com about sourcing them from 'somewhere else' during the rush to meet demand or something. That was when they were selling for $159 and selling out the same day.
Thanks, everyone, for the replies. Seems to me everyone was trying to help in their own way, even if the signal-to-noise ratio got a little high at times.
Funny, I had the exact same thought. I went with an LMT BCG through LMT's website. However, to be fair, LMT's website was about as helpful as Yankee Hill's. I couldn't find any details there either. Logically, if I applied the same rationale to both websites, I would not have purchased from either one.
But I am aware of LMT's reputation and not aware of Yankee Hill's. Also, I wanted to get LMT's charging handle, so I bought both on faith and in the hopes of saving shipping costs by ordering once rather than twice.
LMT Rocks but their web site is a little tough at times. I think they recently updated it. I've not seen their catalog. I know when a company takes the extra effort to inform the buyer I appreciate it. BCM and Grant do a good job. It helps to know what you're buying.