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Thread: Sheared extractor

  1. #11
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    Thanks.

    Will see what we can get done on Tuesday and will report back.

    Here's the shooter in question, proving that slow and steady wins the race. Despite having a catestrophic malfunction with the carbine, the shooter that finished first failed to neutralize a target, and the shooter with the malfunction was able to clear his issue and finish the stage.

    Ironically, it was the shooter in gray that helped him clear it.


  2. #12
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    Did you mean 12K? 120K is hard to believe. If it is 12K he probably needs to look at an overhaul and inspection to include some gaging. I would say minimum headspace and firing pin protrusion since I know the other gages are a PITA to locate.

    Quote Originally Posted by jackinfl View Post
    How is the gas port measured? Interior dimensions with the dial caliper? What are the szie ranges for "in spec"?

    By the way I asked the shooter how many rounds and he said 120K. But this was a quick off the cuff comment... I have known him for a few years and this is the gun he uses.

    One point, but I do not think it is directly related tot he extractor, but a year ago at a class upon inspecting his gun I found that his ejector had very litttle spring tension. I pulled it out and the spring was broken in two pieces.

    Jack
    Last edited by Iraqgunz; 07-29-09 at 10:09.



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  3. #13
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    just from what i can tell by the photos, inspect the barrel extension, it appears the extractor is slamming into something upon closing, not from ejecting.

    photos can sometimes be misleading.

  4. #14
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    I would say look at ammo first (including chronograph if you can) and then give the chamber a good reaming before you go ripping the gun apart and measuring it. Does the shooter clean the chamber? Maybe the combination of a tighter chamber and thousands of rounds worth of crud finally stacked up?

    Do you have any of the cartridge cases from the gun from just before it sheared the extractors? Any clues on those? Usually you can see signs of overpressure (e.g., flattened primers), "overgassed" (case rim gets noticeably mangled by extractor). If you have excessive headspace - and I doubt that's the issue here - you'll see signs of case head separation or stretch near the back of the casing.

  5. #15
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    Quote Originally Posted by Iraqgunz View Post
    Did you mean 12K? 120K is hard to believe. If it is 12K he probably needs to look at an overhaul and inspection to include some gaging. I would say minimum headspace and firing pin protrusion since I know the other gages are a PITA to locate.
    If it had 120K through it I bet this would not be the only issue it is having!

    I'll be interested to hear what is going on with his carbine.

    Spooky

  6. #16
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    Quote Originally Posted by jackinfl View Post
    How is the gas port measured? Interior dimensions with the dial caliper? What are the szie ranges for "in spec"?

    By the way I asked the shooter how many rounds and he said 120K. But this was a quick off the cuff comment... I have known him for a few years and this is the gun he uses.

    One point, but I do not think it is directly related tot he extractor, but a year ago at a class upon inspecting his gun I found that his ejector had very litttle spring tension. I pulled it out and the spring was broken in two pieces.

    Jack
    I used drill bits using the one that fits the best the mic the drill bit. But you can eyeball it with a micrometer and be pretty damn close if not seeing which drill bit fits the best. You'll need fraction sized drill bits, and numbered drills. 120K would have some serious port erosion and probably bad throat erosion as well.
    Chief Armorer for Elite Shooting Sports in Manassas VA
    Chief Armorer for Corp Arms (FFL 07-08/SOT 02)

  7. #17
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    Quote Originally Posted by gotm4 View Post
    120K would have some serious port erosion and probably bad throat erosion as well.
    I would think that may be an issue, even at 12K. I believe RRA's are a reasonable quality arm for the money. But their barrels are 4140, not the harder milspec steel. Even with chrome, the erosion would seem to be a very decent possibility, if not probability. Personally, I fully expected to replace my RRA barrels after 10K or thereabouts.
    Just one of the Shepherd's sheepdogs. Joshua 24:15

  8. #18
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    Rob_S
    By the way letting him beat me after that I had to FIX his gun was and is BS. I am wining like a little girl. Videos make me look fat! Ok, I am fat.


    GotM4,
    Measuring with a drill set is a good idea. WHat are the specs to look for?


    Thanks,
    Jack
    Colt AR-15/M-16 Armorer, GLock Armorer, HK USP Armorer
    Firearms Instructor

  9. #19
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    I've seen a broken extractor like that once, on a Spikes upper using some reloads a friend supplied. At first we just had a few extraction issues, but after a few rounds my rifle (a Bushy) had 2 or 3 Fail to Extracts, and his rifle (the Spikes) broke the extractor.

    It turned out that he had set the crimp stage wrong on his reloading press (Dillon 650xl) and it had lightly mushroomed the neck of each rifle case (not enough to see the problem, unless you knew it was there)

    I also had a tight chamber on another gun, and while it didn't break the extractor, the gun acted similar to what we experienced that day with the bad reloads. I just fixed that gun today using Ned's 5.56 reamer (very nice tool, worth the money)

    I don't know if that helps your situation at all, but figured I'd contribute.

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