The Pitbull Airguns Dog Collar is a barrel harmonics tuning device for the Daystate Redwolf, Delta Wolf (Coming soon!)  or any other air rifle with a 24mm OD diameter shroud. Easily installed and retained by the thread protector or moderator. The holes on the device can be filled with .22 caliber slugs or pellets depending on your weight prefference. Once you have tuned your air rifle, use the built-in Nylon tipped set screw to lock down your adjustment.
 
See our video in photo collection for installation