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Odd markings on spent primer

dano1
Was just looking at the spend casings from my Sig P220 and noticed a mark off the main firing pin imprint on the primer -looks as if the firing pin hits off center to begin with and then centers as it fires the primer?

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Comments

14 comments

Date Votes
  • perry shooter
    This is a common "PROBLEM ? " with this pistol in 45. most all of them do the same thing .
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  • dano1
    perry - so is my diagnosis of whats going on correct?
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  • rldowns3
    I wouldn't sweat it. The firing pin has some play in it. Shouldn't be a problem.

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  • perry shooter
    I think it is more of a case of the case starting to slide across the face of the slide during extraction before the fireing pin has retracted. Different ammo with different recoil impulse seem to change the effect. Some more some less.
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  • FrancF
    Maybe its the light, but that seems a little extra deep.

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    NRA Life Endowment Member
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  • David Nunn
    I agree with perry shooter.

    SIG pistol armorer/FFL Dealer/Full time Peace Officer, Moderator of General Discussion Board on Gunbroker. Visit www.gunbroker.com the best gun auction site on the Net! Email gpd035@sbcglobal.net
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  • dano1
    Thanks guys..
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  • tr fox
    don't want to worry you but that imprint would worry me.

    Just my humble opinion, but anytime you have two pieces of metal (firing pin and primer) coming together under heavy impact, with something as percision as a gun being fired, I would want a good clean primer indentation.

    I'm just a shooter, but for example, what would happen if you need that gun to fire to save your life and this time the firing pin hit the primer off-center but doesn't center itself and therefore didn't ignite the primer thereby causing a misfire?

    Maybe the firing pin is slightly off center or maybe the end of the firing pin is broken or deformed.

    Quote "Somehow government decided that the Constitutional Bill of Rights has become the Bill of "Suggested" Rights and are to be rationed to the citizens as the power elite sees fit"
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  • rwfixem
    The mark is caused by recoil timing from fired cartridge. Different loads with different recoil springs will increase or eliminate this mark.
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  • ATF
    Quote by tr fox "I'm just a shooter, but for example, what would happen if you need that gun to fire to save your life and this time the firing pin hit the primer off-center but doesn't center itself and therefore didn't ignite the primer thereby causing a misfire?"

    It does not have to strike exactly in the center and a lot of guns don't.[:)]



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    When a worm wants to relax,does he go fishing? "And remember a wet dog doesn't fly at night" "My memory's not as sharp as it used to be. Also, my memory's not as sharp as it used to be." ATF,Eagle Guns
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  • D. Bryan
    If you examine this mark closely, you will observe the firing pin is dragging on ejection. The metal is pulled away from the indentation.
    Something is not allowing the firing pin to retract.
    This is quite common on single shot rifles without a rebounding hammer.

    Active old guy who lives with two dobermans.
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  • ATF
    quote:Originally posted by D. Bryan
    If you examine this mark closely, you will observe the firing pin is dragging on ejection. The metal is pulled away from the indentation.
    The hammer is not allowing the firing pin to retract.
    This is quite common on single shot rifles without a rebounding hammer.


    It will also do this on a lot of semi-autos because the extraction starts a mite early.[:)]

    Eagle_Guns.gif
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    When a worm wants to relax,does he go fishing? "And remember a wet dog doesn't fly at night" "My memory's not as sharp as it used to be. Also, my memory's not as sharp as it used to be." ATF,Eagle Guns
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  • A J Christ
    dano1:
    I see that on a couple of Glocks I shoot and a SIG. That is caused by the slide movement (starting to unlock) before the firing pin is fully retracted. Normal in a number of semi firearms, cloesd bolt autos too.
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  • ATF
    quote:Originally posted by A J Christ
    dano1:
    I see that on a couple of Glocks I shoot and a SIG. That is caused by the slide movement (starting to unlock) before the firing pin is fully retracted. Normal in a number of semi firearms, cloesd bolt autos too.


    Duh!! I think I said that. [:D] [:D] [:D] [:D]

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    When a worm wants to relax,does he go fishing? "And remember a wet dog doesn't fly at night" "My memory's not as sharp as it used to be. Also, my memory's not as sharp as it used to be." ATF,Eagle Guns
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