I can't add much more to this excellent post from Scarlett Pistol, but I'll give it a shot.
The CGW sear and hammer are hardened all the way through the material. The reason why I don't have much to add is that I have only one 75B and I modified it six years ago with a bunch of CGW parts, converted it to SAO, and have been shooting it pretty much unmodified and rarely cleaned since. I don't remember exactly what parts I put in it. As a .22 Kadet host, the 75B frame parts were not touched for several years and maybe 40k rounds. There was no detectable change in trigger feel or pull (a little over 2 lb) weight over that time. Under high magnification, there was no wear at the sear/hammer hook interface that I could see or feel. I changed the hammer and sear to get the pull weight up to over 3 lb so that I could shoot the 9mm slide (after the 10x bushing install) on that frame. I kept the old parts and will put them in a 75B frame if I ever dedicate one to the Kadet slide. I might even show the old parts to CGW when I visit this year, even though David already knows there isn't really anything to see, just like new.
It took years for me to understand what I needed in trigger "feel" for me to be the most consistent with the pistols. For me, trigger reach, finger placement, and the ability to put some pressure on the trigger without it going off are best, thus the ugly grip modifications, etc. This is why I can't pick up a small carry gun and subconsciously shoot it well, as demonstrated in the carry gun video posted yesterday. I have to "think" about how to place my finger and how much I can preload the trigger on the little Kahr subcompact. No problem with the fat P-07! This is also why I liked the P-10C when I first picked it up--one can put a lot of pressure on that trigger without it going off, but it was rough from the factory, just like my P-07!
Joe