My old Nabaztag was the first victim. This time it's the turn of a Nerf Blaster clone:
After removing some standard Phillips screws, I got exactly what I wanted:
The orange "launch" module in the bottom left of the picture. It's a standalone piece that's originally powered by 3 AA batteries but should work fine on a Arduino friendly 5V (or higher :-). Even the mounts can be recycled for the project I'm working on.
The orange "piston" at the top of the picture. I had a simpler design in mind but this one is more compact so it will work even better.
I bought this toy in a local store but I usually go to the flea market in Cormano where I can pick up a R/C car / toy without remote control for a few euros. Way cheaper than buying individual components like wheels, engines, and electrical components piece by pice.
Photos / video of the final project should be available "soon".