I have this tool to loan out. It is a specialized device that lets you remove the barrel nut (bushing) from a S&W 422 or 2214/13 or 622, etc. These guns are great for suppressors since the bore axis is low and below the slide. All they need is a thread adapter (also available from EKW).
If you don't have this tool there is a greater chance that you will damage the crown on the barrel while trying to remove the barrel nut (shown in the second picture).
I'm in Burnsville.