Cheers for the welcome
To be honest, I have no idea if it's a used replica or not; it looks used but this may just be a result of Denix's notoriously dodgy molds/materials. Bought it from a militaria museum here in Australia, there isn't exactly much choice concerning modelguns here because of our strict and ambiguous gun laws.
The reason I suspected that the takedown lever may be somewhat functional is because all the inactive parts of the pistol (slide release, safety) are part of the topslide or frame mold, whereas the takedown lever is a seperate part.
I'll probably end up prying the thing off when my curiosity becomes too much to bear.
I want to replace the guide rod because the rest of the piece is matte black but the guide rod is bright chrome.