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View Diary: Rep. Jeff Duncan says progressives might murder registered gun owners in their homes (143 comments)

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  •  not true, (0+ / 0-)

    For any firearm I have purchased. And I own over 30 of them.

    I've seen high end rifles come with test targets,  but I can't afford those kinds of guns.

    And even if it were true,  it wouldn't be useful. Simply firing the gun changes the marks imprinted on the bullet and case over time enough that,  if comparing a random bullet or case to data captured at the time of manufacture, your odds of coming up with a match that would stand up in court are effectively zero.

    "Ballistic fingerprinting" is a television myth.

    --Shannon

    "It is better to die on your feet than to live on your knees." -- Emiliano Zapata Salazar
    "Dissent is patriotic. Blind obedience is treason." --me

    by Leftie Gunner on Thu Apr 11, 2013 at 08:08:41 PM PDT

    [ Parent ]

    •  If you want to believe the signature (0+ / 0-)

      markings from a new v previously fired firearm are different at a later date I wish you the very best.

      The imprint marking of the firing pin on the percussion cap of the shell casing and rifling groves and lands of the projectile are deemed admissible in a court of law.

      We're not addressing test targets. The firing pin makes a unique signature impression on the percussion cap. The shell casing ejected from an automatic weapon imprints with a signature from that mechanism as well.

      Microscopic evidence of firing pin and ejector signatures have been used to identify firearms for many years and cases.

      I don't care how many firearms you own. I was addressing the request for information from another person, not you.

      I'd go so far as to suggest you not begin a comment with the title you choose. It's adversarial and not in keeping with DKos decorum.

      What, sir, would the people of the earth be without woman? They would be scarce, sir, almighty scarce. Mark Twain

      by Gordon20024 on Thu Apr 11, 2013 at 10:38:06 PM PDT

      [ Parent ]

      •  Depends on how heavily used (0+ / 0-)

        The weapon in question is.  Barrels and firing mechanisms wear with use.  The shell/brass comparisons work on the idea that there haven't been that many shells fired between when the gun was used in a crime, and when the lab test fires the thing.

        Having said that, having reference shells might work for many guns used in crimes. Unlike a gun enthusiast, who will regularly take the weapon out and run a box or two of ammo thru it for practice, the average felon may not have any more ammo than the magazine will hold.  So they don't practice.  The gun is only fired in extremis.

        If they got practice, they might hit fewer bystanders, and wouldn't do things like hold a pistol sideways, with bent elbow, at times above their eyes.  (See any video of convience store holdups)

        This planet needs a lot more kids who think taking a lawnmower apart is more fun than playing a videogame.

        by rjnerd on Fri Apr 12, 2013 at 12:28:12 AM PDT

        [ Parent ]

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