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When you dry fire a 10/22, the forward motion of the firing pin is stopped short of hitting the edge of the chamber by a spring pin in the bolt which fits through a hole in the firing pin.
Dry fire too much and the spring pin could bend or the edge of the hole in the firing pin hole could peen and allow the tip of the firing pin to hit the edge of the chamber. But with the generous tolerances I've seen in 10/22 bolts, you would have to dry fire it hundreds of times before it becomes a problem.
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