I have the KJW M9, and TM mags DO NOT work in it at all. I bought a TM mag, hoping to have an alternative to the chronically leaky KJW mags, and it didn't work. I tried 2 other TM mags, and they didn't work either. Measurement shows the TM mag is about 2mm shorter than the KJW.While it fits in the gun, it doesn't actually fire.
My KJW has seen a couple of thousand rounds worth of plinking, and it still works like new. The mag catch has worn out, and I had to reverse it to left-hand operation, which I don't mind. It still shoots hard (about 310 fps) and very straight and has a nice effective range.
My only beef with this gun is the mags tend to start leaking - not from the valves, but from around the main base seal. I keep fixing them, but they start leaking agian shortly after. I have a couple of mags that are good, and 2 that are perpetually being repaired. Then again, I have TM mags for my P226 that do the same thing all the time too...
As for KSC, I'd say it's definitely a better quality gun all around, but I prefer the feel of the KJW.
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