Fun fact the m690 plastic shotgun is compatible with an aeg spring mine can penetrate through more than five layers of cardboard using 2.0 g bbs :D Edit: just make sure upgrade everything so the spring would not break anything because it will break it a lot faster if you don't upgrade everything to metal trust me it's not a fun experience to happen😢
Fun fact the m690 plastic shotgun is compatible with an aeg spring mine can penetrate through more than five layers of cardboard using 2.0 g bbs :D
Edit: just make sure upgrade everything so the spring would not break anything because it will break it a lot faster if you don't upgrade everything to metal trust me it's not a fun experience to happen😢