Its the circular piece between the springs and slide. It used to be connected to that little stick thing. It will not hold gas or a shot without this part. I have 2 of these guns, and having a spare never hurt. These are probably a .1$ part. I can't find it at any retailers. Any help is appreciated. Also, if 'piston head' is not the right term, please correct me.
Edited by Stealthlead, 13 July 2009 - 08:10 PM.