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Battle Rifle: The M1 Garand
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Firing Pins

Examples of Springfield Armory WWII Firing Pins

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These are the two types of firing pins used by Springfield during WWII.  The round firing pin on the bottom was the original design and the firing pin used through about serial number 500,000.  The design was changed to the half round type at this point. Rifles had the round firing pins changed out during rebuilds.  The round pin was bad to rust in place or be "jammed" up by dust, dirt, mud or muck.  The half round pin had less friction and surface area touching the inside of the bolt.  In later times with the development of more sensitive primers, slam fires could also result from the increase inertia of the round pin.  

Springfield Armory WWII Production