I'm not going over the history of the real steel version nor am I going to go over where, how much, and my experiences with regard to obtaining the TM XDM .40. The XDM functions like any other GBB pistol. I'm heading straight to what people need to know.
The Marui XDM .40 uses the newer type cylinder/piston assemblies like those found on the TM 5-7, Desert Eagle, and PX4. This means that the cylinder and piston head diameter are significantly larger than those found on the TM Glocks, M9's, 1911's, Sig's, and hi-capa series. The larger diameter means that the cylinder has more room for gas