This is my understanding, and it could be wrong, feel free to correct me if so.
But I've been told that the Colt KC's were the cheap version, all alloy (I didn't know they made blued ones), they don't have the intricate lockwork of a Python and you can shoot full house loads all day long with no fear. (unlike a python). But, of course, the trigger isn't as good as a Python can be.
I bought a 6 inch KC. Very first time I took it to the range. First 6 in the 6 inches. Ohhhhh, nice, I like this. I don't think i've shot my Ruger GP100 since. Much much better trigger (of course, coudl be I got a good one). About 2 weeks later saw a 4 inch. Picked that up. The 4 inch is better balanced than the 6 inch, but probably not as accurate. (but i'm not good enough to tell). That 4 inch KC is by far my favorite pistol. I bet i've put 1000's of rounds down it. Everyone who tries it buys either another KC (2 converts so far) or a Python (1, and he still hasn't let me try it
).
And, as you say, the colts get rarer and rarer. I think both of mine were right around 400 when I got them. the other two mentioned above by others were 350 and 425. heck of a value I think.
but yes, I think you are right, if you had both Colts and S&W's you would confuse the cylinder release under pressure. But if you only do it one way, you won't mess it up. I went Colt.
WTT 1 GP100 6 inch for Python 4 or 6 inch.
(kidding)