Thats why I am not sure....System 7 is new, and with KSC a lot of the updated system uses different parts(just look at how many kinds of M9 mags are there for them). I don't know if system 7 will bolt right in to the aftermarket slides that are made for the "old" KSC USP. Hell, it could just be they change the seal and nothing is different. But AFAIK that's not the case.
In the case of the FPS. My guaging point stems from my experience before with their Glock 19 and all my subsequent TMs. That Glock to my knowledge have nothing really done to it other than metal slide+barrel, and upgraded recoil spring. That glock easily out powers my stock TM G26, then my metal kitted Hi-Capa(at the time). It is not until my Hi-Capa been upgraded to the tits to see power like that....now their Glock and USP uses different system so how much of the difference is there I have no idea...
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