Mil-spec firing pin retaining pin. This little guy does an important job by holding the firing pin in place which holds the cam pin which holds the bolt. Don't try shooting without one installed even if Uncle Elmer says it's okay. I replace these things every 10 times I remove it or so. Watch for friction marks on the top of the rounded head, if it's rubbing it ain't supposed to.Features: Steel construction
Ready to drop in and go
Mil-spec
Made in an ISO 9001:2008 factoryYou get: (1) Pin Tools required: Pliers can help guide thru Installation Tips: Point it slightly upwards after insertion so that it gets started into the hole on the far side