Don't shoot the CZ, but I have a FNX45T with a Revolution 45 can and as you comment I've noticed quite a bit of elevated carbon debris blowback. I was originally running a Vortex Venom dot and after about 20 shots fired the glass gets very dirty. Got to the point where I ended up removing the optic and just running stock sights. The slide internals also seem to get dirty much quicker vs shooting without the can. I do a good cleaning after each range trip when running the can. Can't say ive had any function issues with my FNX45, it's a flawless functioning handgun.