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Thread: Government Profile Barrel

  1. #11
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    Thank you for your knowledge about the proper terminology used for various barrel profiles. Do you have anything to add that actually pertains to the substance of his question?

    Vince
    When injustice becomes law, rebellion becomes duty. Thomas Jefferson


  2. #12
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    Quote Originally Posted by CQC.45 View Post
    A Government profile Barrel does NOT have the M203 notch

    A M4 barrel profile DOES have the M203 notch

    A LW barrel profile does NOT have the M203 notch

    The Government barrel is just heavier (although not much) than the LW.

    Many people get the M4 confused with the Gov't, they are NOT the same thing.
    The correct term is standard profile, not lightweight.

  3. #13
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    The M203 notch ABSOLUTELY affects accuracy because it affects the harmonics of the barrel.
    Have you actually measured this or is this based on conjecture/theory?

  4. #14
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    Just to help make it as clear as mud, at this point there are 4 profiles that could be considered Government profiles:

    1. The M16/M16A1 with a 20" barrel, skinny behind the front sight base, skinny in front, 1 in 12 rifling (some of the very early M16s had 1 in 14)
    2. The M16A2/A3/A4 with a 20" barrel, skinny behind the front sight base, heavy in front, 1 in 7 rifling
    3. The M4 with a 14 1/2" barrel, skinny behind the FSB heavy with a groove for the M203 in front, 1 in 7 rifling
    4. The M4 SOPMOD with a 14 1/2" barrel, heavy and two flat spots behind the FSB, heavy with a groove for the M203 in front, 1 in 7 rifling

    A simple note: As issued the M4 Carbine has a barrel that is a "Short Barrel Rifle". To own a close civilian knockoff that does not need to be registered you basically have two options, using a rifle with an extended flash supressor like: http://www.bravocompanyusa.com/BCM-M...4-14%20a2x.htm or a slightly longer barrel like: http://cmmginc.secure-mall.com/item/...Upper-w-A2-990
    In either case the flash supressor would need to be permanently affixed using one of the common techniques like drilling, pinning and welding.

  5. #15
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    Quote Originally Posted by bp7178 View Post
    Have you actually measured this or is this based on conjecture/theory?
    If you will notice, my post went well beyond what you quoted and I feel I gave a very clear explanation of what I believe is happening to the barrel as far as vibrations are concerned. I studied everything I could find on the ERRORNET with regards to barrel harmonics and my conclusions are based on those studies. The physics of vibrating bodies is not a difficult topic to grasp if you have the time to study it. The math however is a royal pain in the keester and I don't get that part. SO,You can call it conjecture/theory if you like. If you feel as though my conclusions are incorrect please feel free to give an opposing view on the matter. I welcome intelligent opposing views. This is how we learn and grow. So if you got it bring it, if not......

    Vince

    Please refer to the following link to a previous thread in which this very subject was covered quite completely.....and in a civil manner I might add. https://www.m4carbine.net/showthread.php?t=62604
    Last edited by EW1066; 12-01-10 at 00:57. Reason: ETA link
    When injustice becomes law, rebellion becomes duty. Thomas Jefferson


  6. #16
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    So it is based on some internet guided theory. Not that its bad, but an unproven theory really isn't something to spout like gospel.

    How significant would these differences be anyway? Given limitations of the rest of the platform, ballistics, barrel material & lining, ammo, gun, trigger, shooter and etc?

    I'm just not buying it.

    I've seen guns with M203 notches that are just as accurate as guns w/o them. If you shoot any chrome lined barrel and are worried about the "harmonics" of the M203 notch, you are barking up the wrong tree. If you aren't using handloads or match ammo, again...wrong tree.

    Even if it did have an effect, it is on the low end of the equation. Very low end.

  7. #17
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    What ever end of the equation it falls on is really irrelevant. An effect is an effect. The question was not about the magnitude of the effect but if there is an effect. Which there is.

    Your points about barrel lining and load and trigger and user are all valid points. But to use your terms, those are not the trees we are barking up.

    Once again if you feel as though something I have posted is in error please feel free to point it out and tell my why it is wrong. I will welcome the chance to learn something new about this subject.

    Vince
    When injustice becomes law, rebellion becomes duty. Thomas Jefferson


  8. #18
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    I slept with Katy Perry last night.

    See that? It's a claim not based at all in fact, just something I want to be true. Until I prove my Katy Perry claim, I wouldn't expect anyone to believe it just because they read it on the Internet.

    The bottom line is you have an idea, which is not proven. At all. My experience has run quite the opposite to what you are saying. I've seen guns, that have the M203 notch, that are just as accurate as others w/o the M203 notch.

  9. #19
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    Have ALL the guns you have seen with the M203 notch been as accurate or more accurate as guns without the notch? What is the sampling size for your conclusion. Or maybe, just maybe your conclusion is based purely on anecdotal evidence.

    Vince
    When injustice becomes law, rebellion becomes duty. Thomas Jefferson


  10. #20
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    theoretically it would be less accurate, but quantitatively who knows.

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