I've had KC .22 target for a cpl of months now and continue to be pleased with its performance. It's accurate enough for Bullseye if revolvers were ever again a choice in that demanding sport. But the sights provided by Colt leave something to be desired...plastic fiber front and a sub par rear that's wobbly and prone to damage with the allen set screw.
After a little research I chose to replace the front fiber optic with a Wilson Combat gold bead, which I like very much, as I'm not able to get a good sight picture with a fiber optic front (old age, bad eyes, blockheadedness or a combo of all). The gold bead just gives me a better view of the ears of the rear vs the top of the front. Hard to explain but it's readily felt when shooting. Too, if desired, it's possible to blacken the bead with a match for a 'Patridge' post effect without ruining the sight. The sight is still held in place with an allen set screw as on the Colt, and I added a miniscule drop of lock tite to keep it snug.
I also replaced the rear with Wilson's made for the new Pythons. My search results showed that that the Python, Anaconda and KC all had the same sights so that's what I ordered. But I had to do a little bit of ultra fine filing to get it fitted (sight was too long between the cross pin and the rear overhang notch). At a guess, I'd estimate I took off 0.010" of the rear face to have a good working fit; all of which took ~!5 minutes and a drop of cold blue to accomplish.
In use the rear notch seems about the same width as the Colt supplied one, but adjustments for W & E are far easier and securely hold their value while shooting. Too, there's no need for the allen set screw locking the windage as on the Colt.
All in all I'm well satisfied with the new sighting arrangements, but do wish Colt had built the gun with sights equal to the rest of the gun's quality, like those offered by Wilson Combat. They're not cheap, and add to the overall cost of the KC but IMHO, worth the expense. .......Best Regards, Rod