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Thread: Heavier spring or heavier buffer: which is better?

  1. #41
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    For these springs that lasted 2000, 3000 rounds - I would love to know if they were out of spec to begin with.

    By the way, stainless spring wire costs 2.75 times more than CS wire, yet you can buy a Colt buffer spring for $11 - less than some CS springs.

  2. #42
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    Quote Originally Posted by rsilvers View Post
    For these springs that lasted 2000, 3000 rounds - I would love to know if they were out of spec to begin with.

    By the way, stainless spring wire costs 2.75 times more than CS wire, yet you can buy a Colt buffer spring for $11 - less than some CS springs.
    Mine was in spec at 500 rounds it dropped 3/4'' in 1500 rounds.

    SS may be the Ideal service rifle spring but it doesn't make a good spring in general.

  3. #43
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    When I say 'in spec' I don't mean by length. There is no length spec on the drawing anyway.

    I mean.... did the wire meet the minimum tensile strength of the military drawing? Was the wire of the correct certified material? Was the force at the two lengths within spec? Was the wire the correct diameter? Was the heat-treat done correctly? It is hard to know the answers to this stuff.
    Last edited by rsilvers; 09-27-10 at 21:58.

  4. #44
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    Quote Originally Posted by rsilvers View Post
    When I say 'in spec' I don't mean by length. There is no length spec on the drawing anyway.

    I mean.... did the wire meet the minimum tensile strength of the military drawing? Was the wire of the correct certified material? Was the force at the two lengths within spec? Was the wire the correct diameter? Was the heat-treat done correctly? It is hard to know the answers to this stuff. Buying a Colt spring will increase the chances of it being in spec.
    No didn't send it off to to nasa for a failure report analyzes
    Next AR I will try your suggestion and see if I get better results.

  5. #45
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    Quote Originally Posted by Thomas M-4 View Post
    SS may be the Ideal service rifle spring but it doesn't make a good spring in general.
    Are we talking about the same thing here?

    17-7 precipitation hardened wire, condition H900?

    http://tiny.cc/nfcci

  6. #46
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    Quote Originally Posted by rsilvers View Post
    Are we talking about the same thing here?

    17-7 precipitation hardened wire, condition H900?

    http://tiny.cc/nfcci
    Sorry USGI .

  7. #47
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    FYI- I am using a Springco spring in my suppressed (AAC) SBR (11.5") as well and still had issues with bolt lock back- not cycling issues. Once I added an H2 I was GTG- even with Hornady TAP and other 55gr. I recently acquired an H3 and will be testing that as well. In it's current configuration it runs 100% suppressed and unsuppressed.

    Quote Originally Posted by Boss Hogg View Post
    when I tried to shoot a Noveske 12.5" barrel with an M4-2000 it would not function with a standard USGI buffer spring and H buffer. The bolt cycled so fast that it frequently outran several revisions of the PMAG. It is probably for this reason that the Switchblock was created.

    Sprinco can make all the claims they want, but their red spring allowed my SBR to cycle semi-automatically suppressed, without frequent bolt over base malfunctions. Of course YMMV. I hope that Vltor's new A5 system makes many suppressed SBR problems go away.

    FWIW, Mike Pannone is a strong proponent of Sprinco (and Noveske, BCM, etc). If you read his real-world tests, he generally uses Sprinco springs.
    Last edited by Iraqgunz; 09-27-10 at 23:11.



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  8. #48
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    Quote Originally Posted by Thomas M-4 View Post
    Sorry USGI .
    I know, but I was asking about your saying that stainless does not make a good spring material. I just wanted to be sure you knew that USGI springs were specifically 17-7 precipitation hardened stainless in condition H900.

    Are you saying that 17-7 PH spring temper H900 is not a good spring material?

    The 17-7PH H900 USGI spring will typically last for several barrels - even 100,000 rounds or more. As far as I am concerned, the inspection of it is just to check for a defective spring. You can check it on a scale and it may last for a few barrels. If yours lasted 2000 or 3000 rounds, it was almost certainly not a USGI spring. Also there is no harm in leaving the action locked back in storage.
    Last edited by rsilvers; 09-28-10 at 08:04.

  9. #49
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    Quote Originally Posted by rsilvers View Post
    I know, but I was asking about your saying that stainless does not make a good spring material. I just wanted to be sure you knew that USGI springs were specifically 17-7 precipitation hardened stainless in condition H900.

    Are you saying that 17-7 PH spring temper H900 is not a good spring material?

    The 17-7PH H900 USGI spring will typically last for several barrels - even 100,000 rounds or more. As far as I am concerned, the inspection of it is just to check for a defective spring. You can check it on a scale and it may last for a few barrels. If yours lasted 2000 or 3000 rounds, it was almost certainly not a USGI spring. Also there is no harm in leaving the action locked back in storage.


    I was unaware of USGI spring requirement being 17-7PH treatment.
    Are colt springs 17-7 PH ? Never noticed that being listed.

  10. #50
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    I have not seen a Colt M4 spring drawing, but it is unlikely they downgraded the material used for the M16 spring.

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