Im trying it with the green first. Ive shaved off the ridge and hump, slight trimmed the nub to suit the window. Put it all together and its not firing as i 100000% expected to happen. ive also noticed somewhere along the line ive lost the hop sring the pushes the unit back against the gearbox so I thought maybe the mag / feed tube alinement was out, but upside down and manually loading a bb with teezers, it still doesn't fire. the bucking lips dont seem to be pretruding into the feed tube and pinching the bb so i dont know whats going on.