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Thread: recoil spring life span?

  1. #21
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    Quote Originally Posted by Submariner
    Customers make better decisions with proper education.

    Are ISMI springs Chrome-silicon (Valve) A877 or Chrome-silicon (Commercial) A401?

    So, 8000 rounds on a typical USGI spring is probably too much. Since this one was probably 9 inches and change, would you probably have changed it out earlier, at say, 10 1/4 inches if that spec had been in your data bank?

    Aubrey posted this elsewhere:
    Don't know which CS they use (never asked). The owner did mention that it was the most expensive CS he could buy.

    I would change CS springs out at around 5K. I would change out cheap SS springs at around 3-4K.



    C4
    Last edited by C4IGrant; 01-04-07 at 14:40.

  2. #22
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    Quote Originally Posted by C4IGrant

    ...no one was really ever talking about Springs and proper maintence. This is why I have kind taken it on and want to educate people about spring life.

    C4
    Thanks Grant!

    This is why you've become my "go-to guy" for all things carbine related. Every time I call you I get an education that blows out a lot of the stuff I thought I knew.

  3. #23
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  4. #24
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    Quote Originally Posted by jmart

    Have read that before and is a good data sheet. One of the key points in that sheet, is that some some springs can lose much of their "life" with just 350 compressions! I have seen with some new AR springs and it is shocking to see the spring lose so much of its length so fast.



    C4

  5. #25
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    here is some pictures of action springs. Every one is new and every one is different. First pic spring on the right is a spring from a Colt LEO rifle, SS I assume. The one on the left is from a older preban Colt Govt. carbine. It has a more yellowish tint to it. I assume its not SS (stainless).



    next is two from a gunshow, the black looking one is supposed to be a CMT but I dont think it is. CMT should be SS and this dont look SS to me. The other on the left looks like a regular metal spring.



    and here they are all lined up, every one is a different length and they are all new. The preban carbine spring only has about 50 rounds on it.


  6. #26
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    Are the springs in the Army m4s like the springs in the LEO Colt?

  7. #27
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    Quote Originally Posted by ar_mcadams
    here is some pictures of action springs. Every one is new and every one is different. First pic spring on the right is a spring from a Colt LEO rifle, SS I assume. The one on the left is from a older preban Colt Govt. carbine. It has a more yellowish tint to it. I assume its not SS (stainless).



    next is two from a gunshow, the black looking one is supposed to be a CMT but I dont think it is. CMT should be SS and this dont look SS to me. The other on the left looks like a regular metal spring.



    and here they are all lined up, every one is a different length and they are all new. The preban carbine spring only has about 50 rounds on it.


    How do the lengths of these new springs compare to the standard that Submariner posted?

  8. #28
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    Talking For the "spring snobs" out there...

    Quote Originally Posted by jmart
    How do the lengths of these new springs compare to the standard that Submariner posted?
    All that needs to be done is take the picture with a ruler alongside the springs. Buying a ruler is more cost-effective than arbitrarily picking a round count at which to replace the action spring.

    While few may have been talking about action springs and reliability, the TM cited has been around since the 80's with M4 revisions added in the 90's. RTFM as Rickover used to say.



    "Snob Appeal": the fallacy of attempting to prove a conclusion by appealing to what an elite or a select few (but not necessarily an authority) in a society or community thinks or believes.
    Last edited by Submariner; 01-12-07 at 09:52. Reason: add pic
    "The very purpose of a Bill of Rights was to withdraw certain subjects from the vicissitudes of political controversy, to place them beyond the reach of majorities and officials and to establish them as legal principles to be applied by the courts." Justice Robert Jackson, WV St. Board of Education v. Barnette, 319 U.S. 624 (1943)

    "I don’t care how many pull ups and sit ups you can do. I care that you can move yourself across the ground with a fighting load and engage the enemy." Max Velocity

  9. #29
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    what kind of spring would you find in a real m4 carbine, stainless???

  10. #30
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    A Real M4...

    Quote Originally Posted by ar_mcadams
    what kind of spring would you find in a real m4 carbine, stainless???
    Would have a Colt spring.

    It wouldn't be CS so that pretty much leaves stainless.
    "The very purpose of a Bill of Rights was to withdraw certain subjects from the vicissitudes of political controversy, to place them beyond the reach of majorities and officials and to establish them as legal principles to be applied by the courts." Justice Robert Jackson, WV St. Board of Education v. Barnette, 319 U.S. 624 (1943)

    "I don’t care how many pull ups and sit ups you can do. I care that you can move yourself across the ground with a fighting load and engage the enemy." Max Velocity

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