Eyup Chris, cheers mate.
The stock is made by a local lad - Warren Edwards, I think his details are on here if you do a search, if you can't find them drop me a PM and I'll send you his mobile number. There's some added lead in the stock and a brass cocking aid to get the balance right.
There's no secrets with this gun, it's a standard Mk1 TX in every way apart from delrin front and rear guides. A bloody heavy stock really helps to tame the recoil, but I still have to get everything exactly right for each shot otherwise I miss by a country mile
That's the joy of springers, they're merciless, but when you get it right you know it's not luck.