[Hectic]

Aeg buffer tubes will be fatter then gbbr ones real steel parts fit on most gbbr.
As far as i knos there is one off brand of gbbr that uses mostly aeg parts but for WE's im prety sure its RS stuff you want.
Now that doesnt mean it wont fit but itll be loose and may not lock in place.
Also for RS there ars two types of tubes/stocks a "mil spec" and a standard/civilian type so youll have to find out what one the gbb has. As far as i know the civi stocks will fit on the mil tubes but the mil stocks will be too tight on thd civi tubes.
Hopefully someone with more hands on knowlage can chime in