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It is hard to say when LMT last updated their bolt, but I have run them since the end of 2011 and have not had any issues in 10.5 / 11.5 guns both suppressed and un-suppressed. The extractor tension is almost identical to my KAC E3 bolt with KAC's current gen extractor and springs. I would be game to create a LMT E-bolt graphic much like I did for the E-carrier if enough people post up some pics of their bolts along with the markings engraved on them. Perhaps we can unravel the progressive changes together... Also, I think LMT dealers can get the springs and extractors separately; I think I ordered my spares from Operation Parts.
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Operation parts has the enhanced bolt extractors and springs for sale.
I've been on a waiting list for a couple of things there including the complete E-BCG and they sell a SA E-BC without a bolt but not the FA for whatever reason. Either way I have a spare JP bolt and depending on the configuration that arrives in the mail first I'll play around with the two different bolt combinations in the enhanced carrier.
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I bought mine from a Quantico Tactical store about a year or more ago. I then called LMT and ordered an extra extractor. It did not come with extra springs so I'd need to salvage those if it broke, which is highly unlikey.