The Hydra P90 Kit from Wolverine Airsoft is now available and Bingo Airsoft Works shows how it is installed... "The Wolverine Airsoft Hydra P90 drop in kit is now available. This is an updated kit that replaces the Wolverine SMP P90 kit. It uses the new Hydra P90 engine and the custom 3D printed chassis has been refined to fit even better in the various P90 models."