I may have been mistaken but I thought I heard that all Mosquitos had barrels that were ready for a suppressor and just needed an adapter, similar to the Walther P22. My dad just gave me his old Mosquito (bought prior to or around 2005) and it has 2 areas on it where it looks like you can use a tool to unscrew it, but this covers the entire barrel.

Was I mistaken? Can you not just add an adapter to thread old Mosquitos?

Neither my Mosquito nor my p22 have threaded barrels.

Mine does not have a threaded barrel.

Mine is threaded but it's an option