the best part of the g3c atten ruger theres no pin or plastic little door to lose upon dissassembly.
Yes the Ruger EC9s is a pain to get apart to clean, but it's the pin that's the worst. Glocks and P-series slides are easier to get off.
It's worth it for me to put up with as the EC9s (and LC9) are very small for pocket carry.
But once you figure it out, it's not so bad.
1. The door which covers the pin holding the slide on has a detent of some kind so it needs to be 'popped' off that detent. I carefully take something like the screw-in end of a cleaning rod patch holder (or even end of a ballpoint pen) and push the door down. After a while opening this will get easier.
2. Taking out the pin is hard because you have to precisely align the pin hole by holding back the slide under return spring pressure while pushing a small rod you have to provide into another smaller hole on the other side to push out the pin. You can use a paper clip, but I've had problems with it bending. So I got a small nail with a head on it. (Optional) I cut off the pointed part of the nail and filed it down just to allow a little more metal contact with the pin. This makes it much easier to align in the hole, put enough pressure to push the pin out. Plus, if my grip on the slide loosens under spring pressure, it retains the slide enough so I can adjust my grip and keep pushing.
Like I said, it's worth it to me and not that bad once you get the hang of it.