^^^
I've never heard of extractor vibration. I've not seen any info on this or what the symptoms are. My guess is that its a way to sell special bolts to solve a problem that doesn't exist, or is minor and only seen in full auto.
This is right, the LMT enhanced also has two extractor springs. But I don't know that its really necessary. I keep an extra bolt and cam pin with me instead of buying enhanced bolts.
Seems like a lot of people have come out with "enhanced" BCGs. Most have faded away because they didn't live up to the hype. I don't know jack about KAC BCGs, but LMT seems legit. The Geissele REBCG (C158 FORGED bolt) has not been around long enough to tell. Others meh...
I do have a couple LMT enhanced BCGs, but I mostly just keep extra BCM bolts with me. I'm not shooting nearly as much as I was anyway, but it seems to me that an extra complete BCG, or extra bolts are the way to go.
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