I finally got to the point where I could put some primer on my car so I broke out the new gun I bought from a local tool shop a few months ago just for primer. After reading your problems I thought I would take it apart and see what I would find before using it. And wouldn't you know it I found what looked like a lot of oil in it. I rinsed everything with acetone then sprayed a cup of acetone through it. Hopefully I won't see any fisheye when it comes paint time.