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Firearms WTB: KAC ECC or Delta EMC

Is it because lack of ambi lower? Aside from that, I thought EMC and ECC are the same thing aside from rail.
and agree it is probably not a trade-in

Can you point out any other differences?

A buddy pointed out that it had a single ejector vs dual, and non ambi lower.

Idk if they'g go as far as dimpling an EC to convert to ECC/ K1. But, that has to be an EMC with URX 3.1 on it