WE Scar H GBB Stock Search

Greetings from Germany I have a problem I got a WE Scar H GBB in an exchange but unfortunately this has an AR 15 shaft adapter on it but I would like to have an original Scar shaft again or a Masada (ACR) shaft the question is which shafts E.g. from VFC, Double Bell, Cyma fit? Unfortunately, I can't find exact information if anything can fit at all. I don't want to import a WE shaft from China or Taiwan because it will cost well over 120€ that's not worth it for me