there are no threads for the feedneck like the ion has, the feedneck is held to the breach byh the plastic body.
The early sp8s had that problem. The feednecks weren't machined right and the paint would get stuck before entering the breach. Look at the end of the feedneck that sits on the breach opening, the hole should have a small lip that catches paint. Pressure on the ball stack keeps it from falling through when it catches on the small lip. You can simply sand a very small amount off that lip to smooth it out and the paint should drop right in.
I can take pics later if you need more help, its not a big problem and is easy to fix.