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1911 stuck firing pin

Discussion in 'Gunsmithing and Repairs' started by ffg, Mar 20, 2013.

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  1. 1911Tuner

    1911Tuner Moderator Emeritus

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    Does the primer look "smeared" and shiny in the center? Check the headspace.
     
  2. ffg

    ffg Member

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    On the brass picture the top is from the caspian, the lower two are the springfield slide. One of each shows the dimple on the slide decently.
    The slide is the caspian. There is a scratch in the breechface from deburring the firing pin hole. It's just cosmetic but since I was bouncing light off the face to show the dent, the scratch is quite prominent.
    Headspace was checked, was told it was 'zero'.
    My plan for the moment is to go to the .195 slide stop and put about 500 thru it and see what happens. 250 of mine and 250 of factory. Then put the .203 slide stop back in and repeat.
     

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  3. cauldron

    cauldron Member

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    500 rounds on a gun with a part that is out of spec seems like a bad idea. A couple rounds to see what the primers look like maybe.
     
  4. ffg

    ffg Member

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    I understand what you are saying, but it takes quite a few before it rears its ugly head. I need to get a few gauge pins(.065-.069) to more closely watch the progress. I will get a bushing put in but I would like to try to figger out what part is causing this. I thinking right now that maybe I need a new frame for the new parts and put the old SA GI back together.
     
  5. 1911Tuner

    1911Tuner Moderator Emeritus

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    You've got some primer flow.

    Was it actually gauged?

    There's a common but mistaken belief that dropping a cartridge into the chamber to see if the case rim sits flush with the rear face of the barrel hood is a reliable headspace test. It's not.

    You can do a rough check that'll get you pretty close with a resized case, a dial caliper, and a set of automotive ignition feeler gauges.

    Work the case under the extractor and slip the barrel into the slide and the case into the chamber. Push the barrel up into the slide the way it is in battery.

    Start trying different feeler gauges between the breechface and the case until one enters with moderate resistance.

    Measure the case length and add the gauge thickness.

    GO...minimum...is .898 inch. NO-GO...excessive...is .920 inch.
     
  6. JRH6856

    JRH6856 Member

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    It's quite prominent on the case head in the lower left of the brass pic as well.
     
  7. ffg

    ffg Member

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    The lower two pcs of brass are from the springfield slide. The picture is of the Caspian slide.
    Headspace was gauged. I brought it in to Tussey's shop and he checked the headspace and test fired it. He said to seat my bullets a bit deeper in tha case (I let the lead bullets bite the rifling .025). He then added 'go now and sin no more'.:evil:
    Well, we might never know the problem on this project. Found a pre '26 style Caspian frame and the slide is being fit to it. The springfield will be returned to its pre-messed with condition. All the recently purchased new parts will then go on the new caspian. I'll have a bushing put in the slide.
    Thanks for all the help,
    Brian
     
  8. JRH6856

    JRH6856 Member

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    Comparing the slide and the brass photos, the scratch measures and looks like an exact match. So a bigger mystery might be how a scratch on the Caspian slide got impressed in the cast fired in the Springfield slide.

    Building a new gun and reassembling the original sounds like the best idea, but if the problem persists in the new build, take Tuner's suggestion and confirm the headspace of the Wilson barrel.
     
    Last edited: Mar 22, 2013
  9. Blue68f100

    Blue68f100 Member

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    I don't know if it's an illusion, but the FP seams to be setting down. Have you checked the FP bore closely for spec?
     
  10. ffg

    ffg Member

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    Before the slide was damaged I used a set of minus gage pins to determine it I could use the springfield firing pin. The fp hole was .069. My fp was .071 so I used a .065 firing pin. As pictured, the hole is .067 because that was the closest (to .069) reamer I could get my hands on (drills were to short!).
     
  11. Blue68f100

    Blue68f100 Member

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    I see listing for 0.068" FP all the time but have not measured one to see what they actually measure. Wonder if yours is too far under size.
     
  12. ffg

    ffg Member

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    Don't know the spec on firing pin clearance. Have to look it up. Didn't think two thou per side was that terrible though. I'll have a bushing installed in the slide so I get another shot at it.
     
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