If you are looking for CO2 version of the M&P 40, there is one made by KWC and it is a fixed slide one. The frame is made of polymer uses a Glock style break trigger as a safety, and a fixed hop. The Salty Old Gamer one got one to take for a spin in this video... "this KWC M&P 40 airsoft pistol is a stylish yet affordable airsoft sidearm. Let's put it throught the paces."