[mcguyver]

Building a solenoid to directly drive the piston forward is a waste of time and thought energy. You will never make it work.

That being said, pulling the piston back and getting a spring to propel the piston forward may be workable, but a gear system will still need to be involved as you will not get a solenoid small enough to fit inside the gearbox that can generate enough linear torque, nor have enough linear motion.

I am sure the generation of today does not take too kindly to being told that something can't be done, and don't waste your time. But, more often that not, it is reality.