Cant speak for the KSC however, I have a TM G17 moded with PGC slide and barrel reinforced recoil and hammer spring.....(getting high valves and tanio riffled barrel shortly

and it's by far THE most reliable; straight and far shooting GBB I HAVE EVER OWNED, at least 290-300 fps (without high valves) its solid as a rock, and never fails...for those wondering I highly recommend the TM G17, seems TM incorporated the best of their "high kick, high grouping" technology, just be prepared to go after the metal mods to improve performance, stock its solid, but you know you'll want to upgrade to getter a better ROI.