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Thread: Action spring pressure measurements.

  1. #1
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    Action spring pressure measurements.

    DISCLAIMERS: a) I am NOT a spring engineer (or an engineer of any type), b) I own both Springco and SSS/Tubbs CS springs (in fact I have owned every spring used in the video aside from the Springco Orange and the Tubbs .308/42 coil springs), c) I am FULLY aware that David Tubbs is an advocate of his own products, so spare me the commentary on that. I get it.

    Here is a video where David Tubbs uses a pressure sensor installed at the rear of a carbine receiver extension which has been fluted and he tests the following springs for pressure at both installed height (in battery) and compressed (bolt lock-back) positions. You can also see the springs oscillate as they return to battery (though I'm not sure this has any actual bearing on reliability or longevity).

    https://www.youtube.com/watch?v=8fMVZbrnvu8


    It seems to verify that the WHITE is Springco's best offering for CAR REs.

    David tests the spring in the following order:

    Worn CAR spring of unknown manufacture
    New CAR spring of unknown manufacture
    Tubbs/SSS AR15 CS Flatwire spring
    Springco WHITE CS spring
    Springco RED CS spring
    Springco ORANGE (.308) CS spring
    Tubbs/SSS .308 CS Flatwire spring


    It's an interesting video, all in all.
    "That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892

    "The body cannot go where the mind has not already been."

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    I'm going to check that out.... rsilvers did some sort of testing on spring/buffer combos... I forget the exacts... but essentially he found that the H2 buffer most closely mimmicked the Rifle Buffer system.

    I don't think he messed with the CS spring variants though.
    "You people have too much time on your hands." - scottryan

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    Quote Originally Posted by markm View Post
    I'm going to check that out.... rsilvers did some sort of testing on spring/buffer combos... I forget the exacts... but essentially he found that the H2 buffer most closely mimmicked the Rifle Buffer system.

    I don't think he messed with the CS spring variants though.
    IIRC Rsilvers did some spring stress calculations as well.
    "That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892

    "The body cannot go where the mind has not already been."

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    Shame he didn't have a Sprinco Blue carbine buffer spring to test.

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    Quote Originally Posted by ColtSeavers View Post
    Shame he didn't have a Sprinco Blue carbine buffer spring to test.
    I agree, since the RED is basically unusable for most properly set-up carbines.
    "That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892

    "The body cannot go where the mind has not already been."

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    Quote Originally Posted by BufordTJustice View Post
    I agree, since the RED is basically unusable for most properly set-up carbines.
    Fairly informative regardless though. Thank you for posting it and apologies for forgetting to thank you in my previous post.

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    I have just taken receipt of a new Tubbs SSS Flatwire CS AR15 recoil spring. I have owned several of these in the past and this one is different in the following ways:

    1) It has a newer coating that is VERY slick and smooth as it reciprocates in the RE.

    2) It has a slightly smaller OD that allows it to be installed and removed much more easily.


    As the video above stated, it does work with even more linearity than the std Vltor A5 spring (which is the smoothest shooting, and most linear spring I have used with the A5 setup). It stacks a little bit toward the rear of the RE, but is is noticeably less than the Vltor A5 spring and quite a bit less than the Colt Rifle spring, BCM Rifle spring, Wolff rifle spring (std power), or the Springco GREEN rifle/A5 spring.

    I also just purchased and installed an SLR Rifleworks Sentry 7 set-screw adjustable gas block on my "Handy Rifle" (which has turned out to be handy-as-F@$&! ) and will be testing with this spring and the std Vltor A5 spring.

    http://slrrifleworks.com/index.php?r...&product_id=84

    I'll get a thread started for my Sentry review this coming week. So far, I am VERY impressed with the design, QC, fit, and finish of the gas block. I also am local to SLR Rifleworks and got to meet the owner (Todd) and the shop guys....a solid crew. Write up coming soon on that.
    "That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892

    "The body cannot go where the mind has not already been."

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    DT spent 18+ minutes saying nothing. I have no idea what he is trying to accomplish with this video as there is so much wrong with it. At least he halfheartedly admitted he was trying to sell springs. Just because a shaped wire spring works good in a pistol, doesn't mean it will work well, or better than round wire, in a rifle or carbine.

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    Quote Originally Posted by markm View Post
    I'm going to check that out.... rsilvers did some sort of testing on spring/buffer combos... I forget the exacts... but essentially he found that the H2 buffer most closely mimmicked the Rifle Buffer system.

    I don't think he messed with the CS spring variants though.
    Action Spring Analysis

  10. #10
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    Quote Originally Posted by MarkG View Post
    Thank you for finding that post.

    Now that I re read it, all that data is from a computer program and not actual observed data.

    The predictions offered don't completely reflect my real world experience. Such as the colt carbine spring being a low stress item.... when I see them get noticeably weaker and shorter in just a few thousand rounds in carbine after carbine.

    His data suggests that shouldn't happen. .. which makes me question the chart.

    Sent from my SPH-L720T using Tapatalk
    Last edited by BufordTJustice; 05-03-14 at 23:20.
    "That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892

    "The body cannot go where the mind has not already been."

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