i was wondering if you could make a longer barrel barrels for the 1000 sb

Depends on what you are trying to accomplish though. For looks and added leverage when cocking the gun then I would suggest a metal brake since it would be the most reasonably priced.

If you want an entirely different barrel for other reasons, I do recall reading about someone who was doing barrel swaps on many of the popular springers. Don't remember his name at the moment but I know you could find out by doing a search on the Chinese and Gamo forums.

Russ S.