Odd that she was attaching a silencer to a revolver pistol

In the scene where Coffy was preparing her gun - which is clearly a revolver pistol, not a semi-automatic type - to take to that "meeting" with Vitroni, we see her attaching a suppressor or silencer to the barrel of the gun. Well, I had always heard that silencers don't work on revolver pistols, because the gas from firing a bullet escapes in that gap between the cylinder and the barrel. The silencer on the end of the barrel will not suppress that noise. So why is Coffy attempting to attach a silencer to a revolver pistol?