Pennsylvania Firearm Owners Association
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  1. #31
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    Default Re: new bill to ban sale of guns that don't microstamp

    Quote Originally Posted by pacodelahoya View Post
    If I'm not mistaken, a recently retired fbi forensic guy said that most of the ballistics matching is smoke and mirrors, I believe there is a thread on it in here.
    1000 posts, yay me..
    Welcome to the club! Ain't it grand.

    I seem to remember reading that they can identify barrel twist, and major grooves, but not necessarily the specific gun unless there are unusual scratches that can be specifically identifed.
    Illegitimus non carborundum est

  2. #32
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    Levittown, Pennsylvania
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    Default Re: new bill to ban sale of guns that don't microstamp

    Firearms and expended projectiles examination is not magic, voodoo or bullchit. Those who do not understand it have probably never peered through a microscope and have no appreciation for the minutia world.

    Two objects cannot contact with force without a transfer of materials occurring. That transfer upsets object 0ne which sheds some and gains other, and upsets object Two by the same process. That change applies to machine tools. If it didn't, tools would never wear out.

    The tool used to bore a barrel leaves traces of machining in the bore caused by the minute imperfections of the tool. It also changes the marks on the tool. Each time the tool makes a new bore, it leaves a different set of markings. The same goes for rifling tools and the rifling the tool produces.

    Ergo, each rifled barrel is as unique as a fingerprint. The bullet that traverses picks up markings from all these imperfections. It being softer, the bullet gets all the change while the steel barrel changes so minutely, the change takes place over a long period from thousands of rounds. Thus, an expended projectile intact enough to examine, can be matched to the firearm it traversed by firing another appropriate bullet and comparing them microscopically.

    Any agent who would say the process is smoke and mirrors would be a class one asshole, or class two if he really didn't know what he was talking about.

    If it was smoke and mirrors, the courts would not accept the expert testimony, much as they won't admit polygraph results.

  3. #33
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    Sep 2015
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    zelienople, Pennsylvania
    (Beaver County)
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    Default Re: new bill to ban sale of guns that don't microstamp

    I have heard that after a gun has been used in a killing it is then "hot" and is shipped off to Mexico.

  4. #34
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    middle smithfield, E.burg, Pennsylvania
    (Monroe County)
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    Default Re: new bill to ban sale of guns that don't microstamp

    Quote Originally Posted by Bang View Post
    Firearms and expended projectiles examination is not magic, voodoo or bullchit. Those who do not understand it have probably never peered through a microscope and have no appreciation for the minutia world.

    Two objects cannot contact with force without a transfer of materials occurring. That transfer upsets object 0ne which sheds some and gains other, and upsets object Two by the same process. That change applies to machine tools. If it didn't, tools would never wear out.

    The tool used to bore a barrel leaves traces of machining in the bore caused by the minute imperfections of the tool. It also changes the marks on the tool. Each time the tool makes a new bore, it leaves a different set of markings. The same goes for rifling tools and the rifling the tool produces.

    Ergo, each rifled barrel is as unique as a fingerprint. The bullet that traverses picks up markings from all these imperfections. It being softer, the bullet gets all the change while the steel barrel changes so minutely, the change takes place over a long period from thousands of rounds. Thus, an expended projectile intact enough to examine, can be matched to the firearm it traversed by firing another appropriate bullet and comparing them microscopically.

    Any agent who would say the process is smoke and mirrors would be a class one asshole, or class two if he really didn't know what he was talking about.

    If it was smoke and mirrors, the courts would not accept the expert testimony, much as they won't admit polygraph results.
    shh, next thing they will require every single barrel be slightly different so they have a circumference "barcode" to identify with.
    "The only thing necessary for the triumph of evil is that good men do nothing."

  5. #35
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    Default Re: new bill to ban sale of guns that don't microstamp

    Several swipes with a stone and the micro stamping is gone. This is the same goal as the "smart guns", add cost and be a pain the ass.

  6. #36
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    Sterling, Pennsylvania
    (Wayne County)
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    Default Re: new bill to ban sale of guns that don't microstamp

    New business, refurbish and replace firing pins with false #.

  7. #37
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    middle smithfield, E.burg, Pennsylvania
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    Default Re: new bill to ban sale of guns that don't microstamp

    Quote Originally Posted by Qtrborecrazy View Post
    New business, refurbish and replace firing pins with false #.
    bah, i would start a business that puts this on them.
    or the optional "u mad bro?"
    "The only thing necessary for the triumph of evil is that good men do nothing."

  8. #38
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    Apr 2014
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    Pittsburgh, Pennsylvania
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    Default Re: new bill to ban sale of guns that don't microstamp

    Quote Originally Posted by eagleclaw View Post
    ...the possibility that criminals and maybe even police agencies will invent a way to forge microstamping numbers...
    Guaranteed that it already has been invented.

  9. #39
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    Default Re: new bill to ban sale of guns that don't microstamp

    Quote Originally Posted by dkf View Post
    Several swipes with a stone and the micro stamping is gone. This is the same goal as the "smart guns", add cost and be a pain the ass.
    Not a problem. Just make possession of such a gun a felony, with "it wore off" as a non-defense....which is their real goal.

    Quote Originally Posted by Qtrborecrazy View Post
    New business, refurbish and replace firing pins with false #.
    Same guys currently remove serial numbers from frames. I'm sure they would be happy to expand into a new area.

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