Don't want to be a negative Nancy, but I modded my Spyder compact in 96 to be electric and within a year had eyes in the breech.
I actually got the idea from another guy who did the same thing about six months earlier. We both still have our guns and could gather at least a dozen who will vouch for us.... for what it's worth.
*The four eye system is a bunch of BS. I got the same results with my Ego by just positioning the eyes at the top of the breech, just above the ball. The logic is slightly more complex, but it works better than the 4C system.