Theres no Turkish Tempest in the book cause its not a Webley its a turk..
It shouldnt be in there, nor should the other later turk airrifles
Another difference between uk and turk tempest should be the rollpins used; massive vs hollow.
Imo, maybe the only improvement the turk has over the uk version
You can recognise a turk easily by its looks, its matte instead of shiny and I think grips arent the same either