Installing the DiOrio crescent firing pin in a 10-X breech bolt...


CYA friends:


The extractors of the 10-X action protrude into the firing pin bore of the breech bolt, so the firing pin is relieved for clearance...


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To install the DiOrio crescent in a 10-X breech bolt requires the crescent pin to be relieved like the 10-X firing pin.


Your friend, Bill gun fool Calfee