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Thread: LWRC 10.5, or LMT 10.5 upper?

  1. #51
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    Quote Originally Posted by jcote258 View Post
    Sure, just from shooting both in a full auto/select fire setting. Unsuppressed, a piston will keep a majority of the grim out of the tight tolerant upper receiver also known as the not shitting where you eat saying, where as the DI sprays carbon into the upper receiver and buffer tube. This is obvious and nothing new here. When shooting suppressed full auto either piston or DI, back pressure from the suppressor blows back over the bolt once disengaged and leaves "streaks" of carbon all over the side of the BCG. Also on clean up, carbon from the piston rifle made its way into the buffer tube, lower receiver, and optics.

    After about 500 rounds of shooting select fire with a suppressor, the piston showed a slower cyclic ROF and you could hear the BCG "grinding" in the upper receiver from the carbon replacing lubricant but continued to fire in semi.

    The DI weapon also began to show the same symptoms but only after about 250 to 300 rounds. Where carbon blows back the BCG and back pressure release into the upper receiver, is seems you get almost twice as much carbon in the upper receiver than piston system. Does this make a DI system inferior? Absolutely not, the DI system is tested proven system and continues to perform, hence the still current use in current military.

    One of the guys that tunes weapon systems (polished triggers, custom machining, ect..) swears by the DI if running full auto, I personally like piston. Both are great weapons, DI has a better chance of becoming up and running if failure is evident for parts reason where as failure is only a matter of being made by man so its not a matter of if but more a matter of when. Personal preference is bottom line, and back to the topic, save your money and keep the 11.5, my 10.5 (piston and DI) are fun as hell but you won't notice any gain with an inch. Take care.

    Jon
    This still does not address your claim of gas-tube failure.

    "Addressing the problem of shootings by ban or confiscation of non-criminal's guns is like addressing the problem of rape by chopping off the Johnson of everyone who DIDN't rape anyone while not only leaving the rapists' equipment intact, but giving them free viagra to boot." --Me

  2. #52
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    Quote Originally Posted by winfield813@yahoo.com View Post
    Jcote, doesn't the following video obviate your 250-300 rd gas-tube claim?
    http://www.youtube.com/watch?v=fWAs4...layer_embedded
    Not entirely, I'm not knocking the DI guns at all, I'm talking suppressed full auto/select fire is where you will notice a difference in DI and piston guns.

    Failure of the gas tube may also be a problem with quality control and man made errors, some make it as you see in the video and others fail before the 300 mark.

    I'm merely saying that's it's not practical to shoot the weapon in that manner and it depends on how you will be shooting the weapon and you should choose a platform accordingly.

    I'm just giving a little experience info, you guys don't have to attack what i am saying. Take it or leave it is up to you.

  3. #53
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    Quote Originally Posted by jcote258 View Post
    Not entirely, I'm not knocking the DI guns at all, I'm talking suppressed full auto/select fire is where you will notice a difference in DI and piston guns.

    Failure of the gas tube may also be a problem with quality control and man made errors, some make it as you see in the video and others fail before the 300 mark.

    I'm merely saying that's it's not practical to shoot the weapon in that manner and it depends on how you will be shooting the weapon and you should choose a platform accordingly.

    I'm just giving a little experience info, you guys don't have to attack what i am saying. Take it or leave it is up to you.
    We're not attacking you, just exploring your statements' implications . . . we have seen the piston versus DI horse flogged too often not to be inquisitive of all pro-piston claimants.

    "Addressing the problem of shootings by ban or confiscation of non-criminal's guns is like addressing the problem of rape by chopping off the Johnson of everyone who DIDN't rape anyone while not only leaving the rapists' equipment intact, but giving them free viagra to boot." --Me

  4. #54
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    Quote Originally Posted by winfield813@yahoo.com View Post
    We're not attacking you, just exploring your statements' implications . . . we have seen the piston versus DI horse flogged too often not to be inquisitive of all pro-piston claimants.
    Here is another video of the DI guns performing in a manner that goes above and beyond the claim of the 250-300 round gas tube failure, I personally haven't had the gas tube fail on me, i choose not to run my weapons to that extent but have had reliable personnel tell me of this failure and all i can say is, "really, no shit, that's not good." He didn't explain why or if it was a matter of craftsmanship but once you hear something coming from someone reliable than it tends to stick.

    Your right I don't have evidence of this failure and personally haven't had the failure happen to me, thankfully. It was just something that I thought that I should mention because it happened to someone else.

    http://video.nytimes.com/video/2010/...ring-test.html

  5. #55
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    Quote Originally Posted by jcote258 View Post
    Sure, just from shooting both in a full auto/select fire setting. Unsuppressed, a piston will keep a majority of the grim out of the tight tolerant upper receiver also known as the not shitting where you eat saying, where as the DI sprays carbon into the upper receiver and buffer tube. This is obvious and nothing new here. When shooting suppressed full auto either piston or DI, back pressure from the suppressor blows back over the bolt once disengaged and leaves "streaks" of carbon all over the side of the BCG. Also on clean up, carbon from the piston rifle made its way into the buffer tube, lower receiver, and optics.

    After about 500 rounds of shooting select fire with a suppressor, the piston showed a slower cyclic ROF and you could hear the BCG "grinding" in the upper receiver from the carbon replacing lubricant but continued to fire in semi.

    The DI weapon also began to show the same symptoms but only after about 250 to 300 rounds. Where carbon blows back the BCG and back pressure release into the upper receiver, is seems you get almost twice as much carbon in the upper receiver than piston system. Does this make a DI system inferior? Absolutely not, the DI system is tested proven system and continues to perform, hence the still current use in current military.

    One of the guys that tunes weapon systems (polished triggers, custom machining, ect..) swears by the DI if running full auto, I personally like piston. Both are great weapons, DI has a better chance of becoming up and running if failure is evident for parts reason where as failure is only a matter of being made by man so its not a matter of if but more a matter of when. Personal preference is bottom line, and back to the topic, save your money and keep the 11.5, my 10.5 (piston and DI) are fun as hell but you won't notice any gain with an inch. Take care.

    Jon
    Thank you, I am fully aware of exactly how a DI system AR rifle works. This response you wrote out, however, does nothing to substantiate you claim of gas tube failure within 200-300 rounds.

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