Hello,
could somebody please tell me, where I could find a roller action kit (tuning part with a rolling disk in the sear of the revolver hammer).

Thanks for your help in advance from snowy Germany.

Years ago Cylinder and Slide offered them and Brownells sold the kits. They were not highly thought of and I don't believe they are offered any longer.

This is a wild card idea, but you might want to contact Allem's Guncraft in Zionsville, Pennsylvania (Allem's Gun Craft). Mr Allem and his sons have been coming up with innovative ideas for target shotguns for decades and manufacture some of the most highly thought-of triggers that employ rollers in place of traditional sears.

I don't know if they would be interested in taking on a handgun project, as the design time is extensive for any action type but it might be worth a call. I shoot release triggers in my trap guns - you pull them to set the trigger, hold them back while you track the target and just relax your finger to fire the gun. The Allem Roller Release Triggers I currently use are the smoothest and most easily tuned releases I've ever shot.

The beauty of Allem's design is that you can change the speed of the trigger just by changing roller sizes - for shotguns, they make them in .010" diameter increments.

Ed