I think at the moment they haven't made it this side of the pond yet. I only ordered one a week ago from Tony
and it was the plastic sleeve still.
I am sure it wont be long before they make there way here.
Great kits, I have a HW97 and 2 HW98's with the kits in them and they are very good.
All of the other rifles have TbT kits fitted, and there is a lot of them, which I am pleased with.
Really depends on what you want to do with your rifle and how much you are prepared to pay.
Ade