I realize that the Nagant revolver can only be suppressed because as the trigger is pulled the cylinder moves forward to create a seal with the barrel. However, it's the only revolver known to me that does this.
Does anyone else know of other revolvers that create a seal with the barrel, maybe in other ways?
The video below is showing alternating 7.62 Nagant and .32 S&W in the cylinder showing how the .32 S&W rounds don't create as good a seal when the bullet leaves the cylinder and enters the barrel and allows some supersonic gasses to escape.
Above is a diagram showing the internal mechanisms that push the cylinder forward when the trigger is pulled.