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Old 05-25-2009, 01:43 PM   #1
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Default Firing pin strikes?

Any info on the reason that a lot of import handguns have unusual firing pin strikes to primers? Glocks have almost a figure 8 indent. Several others have a "teardrop" looking dent. My Colt has a round dent, My CZ P-01, round dent, all my centerfire rifles, round dent. Can someone fill me into the reason why??



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Old 05-25-2009, 02:13 PM   #2
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That's the signature of a Glock firing pin. You can pick up fired brass on a range or crime scene and tell it was fired in a Glock.



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Old 05-26-2009, 04:15 PM   #3
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Glock strikes are rectangular but with the primer flow they appear kind of figure 8.

A properly set up handgun that does not use the Glock type flat striker should leave a round indentation in primer. If you see a teardrop shaped mark on the brass it is likely due to premature unlocking. The gun probably needs a new recoil spring (to retard the unlocking) and a new firing pin spring (to pull the firing pin back away from the primer prior to unlocking).

The tail of the teardrop is from the still protruding firing pin dragging on the primer as the barrel drops in the unlocking stage.

Some fixed firing pin open bolt SMG's and handguns designed off such SMG's (MAC-10, Uzi) will make a similar mark as the nub protruding from the breech face can start to indent the primer as the case is being chambered.

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Old 05-26-2009, 10:15 PM   #4
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Default weak springs

Thanks robo. A friend of mine could use new springs. His Taurus 45 leaves the tear drop marks. Come to think of it, he also has some FTF on the same gun. Will try springs.

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