Should someone make a lift kit in order to off-road Corvettes?
I've not heard of anyone making replacement components for the CSX, and I'd be suspicious of trying any that might be released because I think they'd be apt not to work well.
If you've read up on the gun, you've seen Uncle Mas' great American Handgunner article (easy to find on Google and previously linked somewhere on this forum in a post by
moi) that describes how the CSX was a pet project of Brett Curry, the engineer responsible for the original semiauto M&P. Accordingly, it's an engineering marvel intended for use bythose who've been doing this long enough to appreciate what these guys brought to market at an affordable price - a
remarkably efficient package: it's as small as a hammer-fired 12-round 9x19 pistol can be and (at precisely the same size and weight and
feel of a Walther PPK without the slide bite) it's just a delight in the hand. No one says it's the be-all-and-end-all, and it's intended for people with enough experience to recognize that no such devices exist. Most people report it shoots more like a full-sized gun than a micro. It
does have the reset issue - partially addressed in newer releases, but ultimately requiring the shooter to set aside bad habits he might have picked up (and I'm looking sheepishly in the mirror as I type that

).
So, if that was too long to read through, here's a summary: the CSX is a very efficient package that people in the know appreciate for a specific purpose.
Messing with it implies either 1) a lack of understanding of the specialized purpose of the gun or 2) a belief that some clown who develops a spring kit knows more about how to trick out performance with the device than engineers who actually brought forth (and - this is a big one - had the clout to get the suits to actually
market) this specialized pistol.
If a person can't run the CSX in its intended role because of the weight of the trigger pull, that person is probably not an experienced shooter and the gun is not for him/her in that role. Other guns certainly might suit better.