So....a few things I have noticed about this improvement, and perhaps some caution:
No doubt, it takes away creep and 'roll' to the SA break, that little bit of hammer cocking on a competition hammer. To those who have converted their CZ's to SAO, this is an absolute plus. You can see why the Tac Sport models have those two little springs on the back of their sear, as it pretty much achieves the same as this and takes away any sear cage movement on a very light SA break. It also takes away that movement in the manual safeties as the hammer falls....even the right side safety which is often pretty loose doesn't seem to move at all.
However, I have found that the 'stabilizing' pin also makes the DA break happen sooner. A lot of us who have fit aftermarket disconnectors in their CZ's have found that at first the DA pulls all the way back then doesn't drop. By filing down either the underside of the disco's wing or the top of the 'knee' it can alleviate that, but if we take off too much the DA breaks a bit earlier than we'd like, which...
a) doesn't have as much hammer power since it falls before the hammer/spring is compressed as much as before, which can result in light strikes....and
b) you have this 'post-slack' where the hammer falls and the trigger sort of slams back at the end under no resistance, resulting in some trigger-slap and discomfort. The latter not being a huge deal if you're only firing DA for the first shot once every run or competition stage, but I find it not as steady throughout the pull, as your sight picture may jump right at the end because of the sudden lack of resistance.
That's that sort of fine balance that I've experienced trying to fit a disco just right, and the 'stabilizing pin' recreates that same early DA release by I guess not letting the sear cage move that little bit with the DA pull, then causing the trigger bar to come off the disco earlier. Again, great for the SA break, but the DA pull can feel a bit chopped off at the knees.
So I assume one could address this the same way as one does by fitting/filing the disco to tune, but it felt like I had to file more to make a difference than just fitting a disco without the stabilizing pin. So I put the stabilizing pin in a SAO SP01 'longslide', which made the trigger feels like the one on a TSO, and then I took it out of my SP01 Shadow and went back to regular pin, since I liked the DA pull with a Pre-B disco and the SA break doesn't have too much creep/roll to bother me. Yeah, the safeties move again on they hammer drop, but it hasn't bothered men yet when shooting in competition, so I don't think it will form here on. The SAO Shadow 'longside', though, is amazing.
