I call shens on this.
I think I read somewhere a while ago that Eclipse started using a solenoid specifically built for the Ego, I believe starting with the Ego7. Even if they were using a solenoid used for other applications, that's hardly unusual. There are no paintball companies that I know of that build their own solenoids, they either order pre-made ones (the usual course of action), or order ones specific to their application (rare and generally more expensive for them to do).
-edit- Nope, no custom solenoid specifically for the Ego, but they did upgrade it for the Ego7:
http://www.planeteclipse.com/site/eNews.asp?newsID=214