If you can get a helper to wiggle/rock and push down on the cyl. while you push the ring together with a screwdriver in either hand, it should go easy.
The "knock pins" as they are called, keep the ring end gap from working their way around the piston and into the ports where they would expand out and cause a diasterous outcome as you can well imagine.
Are you positioning the ring endgap properly on the "pins"?
The ring end gap has a radious for the pin, not just butting together,look closely it can only go one way correctly.
The "knock pin" in not centered in the piston ring land
It sounds like you are having way to hard of a time installing the piston into the cyl.
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