If you already own a KSC G19, you may be a little disappointed with the G17 - out of the box it's lighter and not quite as "solid" feeling as the 19 and 23F. I've owned a couple of KSC 23Fs, an 18C and TMs 17 and 26. I was never satisfied with the hop-up in the KSCs, and didn't keep the TMs long enough to really get a good feel for them. However, if you're happy with your existing Glocks, you might as well stick with KSC - cross-compatibility of mags and seals is a good thing.
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