On cheap rimfire rifles, the firing pin can peen the metal of the barrel down into the mouth of the chamber, keeping a round from feeding. On better rimfires, there is a cut for the cartridge rim and a relief cut for the firing pin so the firing pin will not hit the barrel.
On a lot of old rifles without a positive firing pin stop (like the Win 94), the constant bottoming out can crystallize the firing pin and it will shatter.
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