I've got a Lantac E-BCG (Fail Zero UCT coated), LMT E-BCG, and multiple LMT E-Carriers.
I actually use the Lantac E-Carrier in my SR15 upper. It's heavy, like a Young National Match. .3-.4oz more than my KAC M16 carrier. The LMT E-Carriers are actually .2-.3oz lighter than the M16 carrier. .5-.6oz lighter than the Lantac.
I got the Lantac for $150 years ago on super sale. I wouldn't pay full price for it, TBH. But it's been a solid BCG and I really like the cam pin. C158 bolt that saw a lot of suppressed SBR use. Still solid.
But it doesn't have any single feature that will significantly reduce or alter gas drive. The enlarged ports are actually beneficial, but those only affect the very end of the cycle of operation.... and, even then, not very much. The heavier carrier mass likely plays as much of a role as anything else.
It's a quality carrier with a really good cam pin and C158 bolt.
The A100/Aermet 100 bolt in the LMT is unparalleled. The entire E-BCG is legend at this point for shorties (especially suppressed shorties). I suspect Knights moved to that in their E3.2 bolt.... but that's my completely uninformed, wild-a$$-guess.
I also use the LMT E-BCG's 308 version in my suppressed AR10 and I'm really pleased with it. 165gr & 168gr Federal Trophy Bonded Tip run like butter with the LMT E-BCG.
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"That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892
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