In his defense he didn't dry fire it as it turns out.
Most modern .22lr are OK to dry fire. It depends on if the firing pin has a stop or will reach the breech face. Some older guns did have FP's that would damage a breech. You can use drywall anchors (#4 or #6??) as a snap cap for a .22lr. They feed and eject very well.
Nice would have never thought to try that.
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