AR-15 .223 vs 7.62x39 Firing Pin

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boostedtt91

New member
Since im going to a gun show tomorrow i wanted to pick up an extra firing pin for my Bushmaster 7.62x39 AR15. Is there any differences in the firing pin between a .223/5.56 & 7.62x39? Pretty much all firing pins for the 7.62 caliber AR's i have seen for sale are considered "modified" to shoot harder primers with steel cased ammo, but can't seem to find the answer im looking for.
 
the model one firing pins they sell are basically modified firing pins from factory firing pins to help ignite stronger primers which are usually in steel cased ammo.
 
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