*edit....not to mention thats a slide for the full auto version of the 26....
ksc & tm are not compatable. Guarder makes a pretty good g26 slide or you can get the kjw set. The kj however has glock27 trades (different caliber) as well as may require destructive mods to the blowback housing.
The rare PGC glock26 slide however is worth every penny & requires little/no modification.
Now to answer your question
www.redwolfairsoft.com or wgc are your best bets.
-muffin, no clue what your talking about; read more.
-noob good luck - alex