Can't speak to the AA conversion kit, but I have used the Colt conversion Units with floating chambers since around 1963. The one I now have is from the 70s. Use the wrong ammo and it can plug up in as few as 25 rounds.
The best ammo I have found for it is the Federal 38 grain AE22 high velocity hollow point. I have not done an exact round count, but since I started using this stuff (I just bought two more cases) I am running 300 rounds plus through the gun before cleaning it. My standard test is to open the slide; if the floating chamber drops to the rear freely when the muzzle is in the vertical position it is good for a while longer. Thus far it has not plugged up at all--I clean it because I choose to, not because it needs it.
This ammo seems to burn very cleanly, leaving just a light ash behind--and very little of that.
I do seem to get the very occasional misfire with this in a Ruger Standard .22 auto.
