Probably the wrong place for this but there seem to be more hits here than elsewhere..... Barry made me a new longer firing pin for a ZB 26 so as to shoot the ??? (furrin') 8mm ammo with the very deep primers. Now I need to know how to heat treat it so it will last as long as the original has....... it is .300 at the big end, about .150 at the small and 3 1/2 long, 4140 material.

How do I properly harden it??? PJH
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