I forgot to mention one point- Asia electric guns have minor differences between the JG versions and their versions. But otherwise from my chairsofting adventures the gearboxes look identical to JG ones,but there's a massive amount of parts usage inconsistancy between each batch as per usual with our Gommie m8s.
I think they could be rebranding Dboys too- Newer Kalash AEGs came with aluminium piston heads and neodymium Chaoli motors which is similar to the stuff you mention. The trades too,Dboys make a KAC PDW with trades IIRC.