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.
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