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Thread: Barrels: Nitrided Stainless vs. Chrome Lined 4150CMV

  1. #21
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    Quote Originally Posted by AKDoug View Post
    Are you planning on running suppressed? Is that the reason for the Switchblock desire?
    Yes.


    Quote Originally Posted by AKDoug View Post
    I have my doubts that a chrome lined barrel will go 20K and hold anything near 1 MOA, and I have the same doubts that a nitrided barrel will go that far also.

    10,000 rounds is a minimum of $4000 for shit accuracy ammo. A barrel change out is something I can do in under an hour. Once the barrels I mentioned above shit the bed, I'll just throw another one on there. The barrel is so cheap compared to the ammo burned, that I don't lose sleep over whether or not it will run past 10,000 rounds.
    When you put it that way, it makes more sense. I was under the impression that the CHF chrome lined barrels were pretty much bullet proof (no pun intended). I guess that's not the case? I have read that naked stainless barrels will start to lose accuracy around 4000-6000 according to the NRA High Power guys. Not that they are unusable at this point, they just won't have the same level of accuracy they started with. But I've also read they can lose accuracy much faster under rapid fire conditions.

  2. #22
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    The point of chrome lining is to enable them to withstand the heat of a combat weapon. If you want a switchblock, and you want it pinned, you will be buying a Noveske stainless barrel.

    I was under the impression that the CHF chrome lined barrels were pretty much bullet proof (no pun intended). I guess that's not the case?
    Nope. I don't want to throw any barrel makers under the bus, but I've seen a $400 chrome lined barrel from a top tier manufacturer, used by a well known instructor, that had dropped it's accuracy significantly at 10K rounds.
    Last edited by AKDoug; 04-09-13 at 01:02.

  3. #23
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    Quote Originally Posted by AKDoug View Post
    The point of chrome lining is to enable them to withstand the heat of a combat weapon. If you want a switchblock, and you want it pinned, you will be buying a Noveske stainless barrel.
    I actually plan on buying the whole upper.

    I don't suppose you have any info on how nitride treated stainless would withstand that same heat for comparison, do you? You mentioned you owned a nitrided CMV barrel, I would assume a nitrided stainless barrel would perform as well or better in that regard.

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  5. #25
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    Quote Originally Posted by Badger89 View Post
    I actually plan on buying the whole upper.

    I don't suppose you have any info on how nitride treated stainless would withstand that same heat for comparison, do you? You mentioned you owned a nitrided CMV barrel, I would assume a nitrided stainless barrel would perform as well or better in that regard.
    I have no clue. I did not seek out the barrel based on it's nitride treatment. I bought the barrel based on the reputation of the builder as making a high quality, economically priced barrel. I don't fire it rapidly because it's a 6.8SPC and it's mission in life is not CQB. I do not possess the proper tools to guage wear, measure temperature, or measure minuscule losses of accuracy as a barrel wears. I keep a log book. If or when the barrel no longer delivers the accuracy I want from it, I will replace it. Last, I don't have enough money or time to wear out any of my barrels at this moment, even though I train weekly and attend classes. I spend more time dry firing and working on my fundamentals than I do shooting high volumes of ammo.

  6. #26
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    Dipping stainless...any stainless in 1400 degree molten salts will kill the natural corrosion property of stainless but the melonite treatment(the black or dark brown on a stainless barrel) then becomes the new corrosion resistance and the stainless is no longer stainless. I understand you want the stainless barrel because of the quality and switchblock. The barrel will be hard, the throat will not fire crack like it does on a normal stainless barrel or at least not near as quick.
    I've made and sold hundreds if not thousands of Melonite treated stainless barrels. IMO they are more accurate than any chromelined barrel, even a cheap barrel melonited is more accurate than an expensive chromelined barrel. They wear very well so you get the best of both worlds. If you want to do mag dumps and blast get the chrome. If you want accuracy get the stainless. JMO
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  7. #27
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    Re: Barrels: Nitrided Stainless vs. Chrome Lined 4150CMV

    What if the barrel extension is already installed? How will that affect the corrosion resistance between the extension and barrel threads where the salt solution seeps in?
    "If force can take away liberty, force is necessary to preserve it. It is the hatred of violence alongside the willingness to use violence that preserves liberty. In order for us to live as free men, we have to hate the violence that takes away liberty, yet at the same time, we must embrace the violence that preserves it. That is the paradox our founders appreciated and made work for over 200 years."

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    Quote Originally Posted by SixEight View Post
    What if the barrel extension is already installed? How will that affect the corrosion resistance between the extension and barrel threads where the salt solution seeps in?
    That's the problem.

    You do not want to nitride a barrel after the extension has been installed. Many, many stories about the extension loosening up from the barrel. The temps and process are so extreme, the two pieces loosen.

    Not good.

  9. #29
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    Re: Barrels: Nitrided Stainless vs. Chrome Lined 4150CMV

    Quote Originally Posted by Brahmzy View Post
    That's the problem.

    You do not want to nitride a barrel after the extension has been installed. Many, many stories about the extension loosening up from the barrel. The temps and process are so extreme, the two pieces loosen.

    Not good.
    From what I understand that wasn't stainless barrels and it only affected a small batch. Some of the same barrels were not treated and had the extension loosen due to not being torqued to spec. So IIRC nitride treatment got a bad name due to a careless few individuals.

    ETA:
    You can also take a few steps pre-treatment to help assure the extension won't loosen if that's something you're worried about. I'm asking about corrosion resistance of the threads and if the process will continue to react under there since the threads can't be reached. The extension shouldn't be removed after treatment. So I wonder if there's an extra step taken that stops the reaction that wouldn't be possible under the threads unless a chemical could be applied that would seep in between the threads and stop the reaction.
    Last edited by Waylander; 04-13-13 at 20:44.
    "If force can take away liberty, force is necessary to preserve it. It is the hatred of violence alongside the willingness to use violence that preserves liberty. In order for us to live as free men, we have to hate the violence that takes away liberty, yet at the same time, we must embrace the violence that preserves it. That is the paradox our founders appreciated and made work for over 200 years."

    -Christopher Brownwell

  10. #30
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    Quote Originally Posted by SixEight View Post
    What if the barrel extension is already installed? How will that affect the corrosion resistance between the extension and barrel threads where the salt solution seeps in?
    I believe that Constructor has written that his barrels are nitrided without the extension on, and have the extension torqued to spec and the gas port drilled in the proper location after barrel nitriding. This avoids the issue of salt issues in the threads, while it also means the gas port interior isn't nitrided, which would be preferable (but may not really matter). I assume this would NOT work with anything that already had the gas port drilled, since the barrel extension at proper torque would probably not line up at the same spot that it did the first time it was installed.
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