Ksc 1911 gbb
 

How is this gun's compatibility with TM? Mags for sure are not compatible however. What accessories are available? IIRC, PDI has made an outer barrel. Anything else?

Can anyone else comment on its reliability (plastic slide version)?

I doubt anything other than maybe the grip panels are compatible. The disassembly process is different and so is most of the hammer/blowback mechanism. And inner barrel and hop-up design of KSC and TM is completely different....

You might be able to use TM recoil spring and hammer spring, but even that could be questionable....