The KWA one was done before Krytac existed .
Basically Defiance licensed KWA to make the GBB vector and they had a big fall out .
Most of the KWA USA staff then left KWA and started Krytac as the airsoft division of Defiance (Kriss).
KWA owned the proprietary gas system as they did the R&D etc and it's based on their gas system so Krytac were not allowed to use it.
At the same time KWA couldn't make the Vector anymore as the license now belonged to Krytac hence why neither party could continue with it.