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Thread: Colt Gold colored extractor spring

  1. #81
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    Quote Originally Posted by Curlew View Post
    Do they use the same wire diameter?
    You be the judge..............


  2. #82
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    Quote Originally Posted by HKGuns View Post
    You be the judge..............
    Well yah, they do look alike — that’s what prompted my question. I was kinda hoping someone might take calipers to them :-)

    IIRC the old silver-colored springs run .021” and the new copper-washed ones .026”

  3. #83
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    Quote Originally Posted by Curlew View Post
    Well yah, they do look alike — that’s what prompted my question. I was kinda hoping someone might take calipers to them :-)

    IIRC the old silver-colored springs run .021” and the new copper-washed ones .026”
    Calipers? Have you ever tried to just pick one up?

  4. #84
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    I remembered having tried a Sprinco 5-coil at some point, and when I went to look for it in the parts box just now, I found that I had one of their 4-coils as well. So I measured….

    Colt copper-washed: wire diameter .026, ends ground, approx 3-1/2 turns by my count. Free height ~.175

    Sprinco 5-coil: wire diameter .025, ends not ground, approx 4-1/2 turns. Free height ~.225

    Sprinco 4-coil: wire diameter .026, ends ground, approx 4 turns. Free height ~.190

    Damage Industries copper-washed: same measurements as Sprinco 4-coil.

    Old-style from unknown mfg: wire diameter .022, approx 3-3/4 turns, ends ground. Free height ~.160

    ETA: I’m glad I did this because until now I had assumed that the Damage Industries spring was the same as Colt’s. Not quite.
    Last edited by Curlew; 02-08-22 at 16:55.

  5. #85
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    p773157121-5.jpg

    Both springs are recommended by some reputable SME's.

    But statistically, the Colt spring is more proven having been in use by the military's current production M4's since 2003.
    Last edited by prepare; 02-09-22 at 04:08.
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  6. #86
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    How many cycles is the Colt spring rated for?
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  7. #87
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    Quote Originally Posted by prepare View Post
    How many cycles is the Colt spring rated for?
    I don't think is required to be "rated" for anything. The only thing it is required to to do is go 6,000 rounds without failing.

    However, I do know of one test where 20 M4s shot 720,000 rounds, and wound up replacing 4 extractor springs, total. It was not in the top ten items replaced, by the way.

  8. #88
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    Quote Originally Posted by lysander View Post
    I don't think is required to be "rated" for anything. The only thing it is required to to do is go 6,000 rounds without failing.

    However, I do know of one test where 20 M4s shot 720,000 rounds, and wound up replacing 4 extractor springs, total. It was not in the top ten items replaced, by the way.
    Thank you lysander.
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