I've put approximately 500 rounds through the Cerakoted revolver I posted the photo of above. The finish is incredibly durable and because it's black the typical powder residue is almost invisible. The residue cleans off easily enough and makes it one the easiest to clean guns I own. At 500 rounds I still do not have a visible turn ring on the cylinder, something that would appear on a blued revolver almost immediately. Over all I really like the black Cerakote over stainless approach on a revolver versus a typical blued gun.
But there is one thing you need to know about Cerakoted revolvers.....
You will get a spot at the end of the cylinder on each chamber where the Cerakote gets worn off due to the hot gasses and flame from firing. The hot gasses and flame that are a normal part of firing a revolver and escape through the B/C gap are directed off the underside of the top strap and back down on the end of the cylinder above the chamber. After a couple hundred rounds the Cerakote is ablated from that small spot and the bare metal begins to show from underneath. From what I have found out talking to gunsmiths and Cerakote applicators this is normal and to be expected. If you don't clean the powder residue thoroughly you may not notice on a black finish.
On the GP100 pictured earlier I polished the ends of the cylinder in those spots so now the "problem" (if you want to call it that) is gone. I already had some bright polished accents anyway and it just added to the look. Here's a lousy cell phone photo to give you an idea of what I'm talking about.
Here's another Cerakoted GP100 I did. One of the reasons I went with even more high polish surfaces was to get away from the nagging cylinder finish issue. The trade off here is a quickly developing turn ring. Seems you can't have it both ways.
