Yes, this gun works, I have tested it. The pieces go together a little bit rough, what with the added mass of paint, so I made sure to put it on thin. A few days before I did this, I took the gun apart and stretched the spring. If you want an Instructable on that, comment and tell me to.
As for the clip, I just taped two clips together, and painted them. The clip took a while to paint because I had to be careful not to put the paint on thick or it won't go in the gun at all. For the black, that was custom, I don't have much black paint, so I thought I should do that part gray. I was thinking of maybe making the clip slightly bent forward so it would look more like a real gun, but I didn't.