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That used to be true, but not anymore. Modern .22s, certainly including the Ruger automatics, have firing pins that are designed for dry-fire. They have a built-in stop that keeps them from hitting the chamber mouth.
My old Mossberg 144LSA target rifle has a firing pin that will damage the chamber. I always used a fired case as a snap-cap.
You can dry-fire a Mk II as much as you want. I've been doing it for many years with no damage.
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