CT II (Verney-Carron) choke tubes are not interchangeable with any other choke tubes, these choke tubes are approximately 2.1" long. These chokes are used in all currently produced Hastings wadlock barrels. Chokes tubes are listed below in the order of the most open to the tightest:
Cylinder (.725" Diameter) Skeet (.720" Diameter) Improved Cylinder (.715" Diameter) Skeet 2 (Light Modified) (.710" Diameter) Modified (.705" Diameter) Improved Modified (.700" Diameter) Full (.690" Diameter) Extra Full (.682" Diameter)
Safety Warning: Unload the firearm before changing the choke tube. Never fire the gun without having the choke tube properly installed in the barrel. Make Make sure choke tube is tight. All chokes should be firmly tightened with an appropriate wrench. Read your gun’s manufacturers instruction book for safe operation.
For more information and additional photos, click on the photo of each choke tube.