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Old November 9, 2011, 08:49 PM   #6
Junior Member
Join Date: October 8, 2011
Posts: 8
there are only 2 generations of firing pins. there are 4 generations of UPPERS, (MkI through IV) but the first firing pin used c-clips and didnt have the triangular head. Chris then redesigned it with machined spacers to keep the pin floating in the bolt as well as shaving three sides of the head to allow gas to escape in the event of a ruptured case (preventing the pin head from acting as a plunger and causing the firing pin to be shot back through the stock in the event of such a failure). the one picture above is the second and latest generation firing pin.
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