Had a KSC G19, reliable little gun. never needed to take it apart until a piece in the hop-up chamber broke. Bitch to replace, but once fixed it was shooting happily again. I think mine had a upgraded hammer spring, as well as recoil spring and ther generic KSC metal kit. Shoots hard and kicks hard. The HW frame feels like a dream. KSC G17 I've heard are a bit less robust than the smaller G19(some parts that are metal on the 19s are plastic on the 17), and does not come with HW frame. I think for Glocks KSC have probably as big a aftermarket as regular TMs.
TM's new Glock I've heard is quite nice. Like all TMs there are plenty of aftermarket stuff out there for it. The blowback system I think is similar to their Hi-Capa's(though not using common parts), so coming from Hi-Capa I think you might be ok for servicing. Though I've heard the hammer/trigger mech for either brand is a bitch to work on. I remember doing hammer spring for my old TM G26 and it was quite intimidating....TM definitely don't have the HW frame like the KSC, and from most of the TM plastic parts I've seen I think they won't feel as good....Hop-up should be better on TM as usual. I've also heard the TM is a tad wider than the real-steel version, thus making it harder to fit molded holster, though truth be told the TM G26 I've had fits the Fobus perfectly...
I think if I were to buy another glock I'll still buy a KSC. They make a shit load of them and I guess its for a reason. The newer "race pistol" version of the G34 and G35 now comes with HW frame as well, which for me seems the most attractive as I am always sorta intrigued by the long slide Glocks....and I do miss the G19 I've had...
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