Hi guys,

I just got a model 19/4 (1982) counterbored. The revolver is new, it come out of a collection of an old man.
Yesterday I shot 50 rounds of 38 special with it, and the cylinder get stuck always after a couple of rounds.
I discovered that it happens when a chamber (always the same chamber) is going to reach the shooting position.
The base of the cartridge scratch the frame of the gun where is the hole of the pin and the cylinder get stuck.
Someone of you guys can tell me what's going on?
It's like if one cartridge doesn't go completely in the chamber, but I don't know if it's really like this.
The gun is perfectly clean ...
What I have to look out?