Originally Posted by Sim123456
I didn't do grouping test yet and I read that KWA are clone of KSC and KJW are clone of Marui.
KWA and KSC are basically the same thing. KSC is made in Japan and guns are all plastic and have full trades. KWA are made in Taiwan (I believe), and usually have trade-less metal slides instead. KJW and TM M9s aren't compatible. The odd part here and there may compatible, but for the most part, they're not. I can tell you for a fact TM mags don't work in a KJW.
As for the PTP, it's not your standard KSC / KWA fare. It's unique and to the best of my knowledge, not compatible (at least for the most part) with standard KSC / KWA mags and parts.