echo1 typically rebrands other makers, they batch order from other manufacturers to their own specifications, often just the same spec as their original brands and have their own trades or markings cut in. They claim to have higher qc standards, but I don't often see anything different from their AKs vs cyma and JG aks that they really are. They also rebrand some vfcs, but they are mainly jg and cyma rebranders.
For a budget gun, cyma AKs are actually quite good. They usually run forever and then when they break they are very parts friendly with most aftermarket parts.
I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.