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Thread: BCM Filthy 14 ??

  1. #71
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    Barrel steels are pretty soft, so the mandrel wouldn't need to be that hard.
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  2. #72
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    Quote Originally Posted by M&P15T View Post
    O.k.....so how the hell is the mandrel made? I can't imagine how precise it has to be made, and how hard the metal is that it must be made from.

    And wouldn't the rifling end-up being the tougher part of the barrel, instead of the raised surface? Or does the steel still flow enough to form itself in a uniform manner even when cold?
    This is going to have most, if not all, of the info that you are looking for:

    http://www.scribd.com/doc/53432034/N...Forged-Barrels
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  3. #73
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    Quote Originally Posted by BufordTJustice View Post
    This is going to have most, if not all, of the info that you are looking for:

    http://www.scribd.com/doc/53432034/N...Forged-Barrels
    The first few paragraphs were indeed interesting. After that, that stupid site wants you to login with facebook, and then pay to read the rest of the article.

    Still, the picture showed what I expected as far as the machinery involved, just nothing on the mandrel.....thanks though, good info.
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  4. #74
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    Quote Originally Posted by M&P15T View Post
    The first few paragraphs were indeed interesting. After that, that stupid site wants you to login with facebook, and then pay to read the rest of the article.

    Still, the picture showed what I expected as far as the machinery involved, just nothing on the mandrel.....thanks though, good info.
    I have the full PDF. PM your personal email and I'll email it to you directly.
    "That thing looks about as enjoyable as a bowl of exploding dicks." - Magic_Salad0892

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  5. #75
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    Quote Originally Posted by BufordTJustice View Post
    I have the full PDF. PM your personal email and I'll email it to you directly.
    Thanks a lot....nothing better than learning new stuff.

    Although this may make me want my next AR to have a CHF barrel.......or not.
    Lucius Quinctius Cincinnatus (519 BC – 430 BC) Power should only be given to those that want it least.

  6. #76
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    Funny, we were just talking about it, and here's a DD rep explaining the process.

    https://www.youtube.com/watch?v=S4qE...ature=youtu.be

  7. #77
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    That's cool. I'd seen tiny clips of a hammer forge in action, but I didn't realize the blank actually gets stretched in the HF process. WOW! Very interesting.
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  8. #78
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    Aside from Colt's testing that reached the conclusion that there was no advantage to hammer forged barrels, have there been other tests done?
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  9. #79
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    Quote Originally Posted by Trajan View Post
    Aside from Colt's testing that reached the conclusion that there was no advantage to hammer forged barrels, have there been other tests done?
    I'm curious as well. I do own one CHF barrel that I got from BCM. I also happen to own a standard BCM barrel. Both are 16" light weights and I get better accuracy out of the CHF. I can put up 1.5 to 1.7 groups with the CHF but I can't break 2 inches with the standard. I know there are many other factors playing in here but that's all I can offer. Both barrels are free floated and I've shot close to 10 different rounds. I'm sure both barrels could be a bit more accurate in the hands of a better shooter.

    I can't comment on life expectancy and probably never will be able too. There's no way I'll ever put more than 30,000 rounds through either of these barrels.

  10. #80
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    Quote Originally Posted by M&P15T View Post
    I'm ignorant on what it actually is, but I have read about it's costs and applications.

    I'm watching the videos now.

    It seems like it's just a process of literally pounding the cold steel, which toughens the steel, but also changes it's shape. I have also read that it reduces stress points in the steel. Is there some sort of bore/rifling plug in the barrel when it is forged? I think I'm still confused as to what, exactly, hammer forging is meant to do. Create the rifling inside the barrel? How would pounding the outside of the barrel create rifling inside it? Create the barrel and the rifling at the same time?

    https://www.youtube.com/watch?v=HrmWN0igJY0
    A mandrel is inserted into a blank which is deep hole drilled. The mandrel has a negative image of the rifling and chamber. As the hammers pound the outside of the barrel, the material deforms around the mandrel and creates the chamber, lands and grooves.

    Any barrel production method is not without it downsides. With CHF'ing, there is a large amount of stress imparted on the barrel. Less important than the particular method is the way in which the barrel maker executes it. For high accuracy barrels, cut rifling is the way to go, but very time consuming. Button rifling can produce a barrel just as accurate as a cut rifled one, but in general terms the level of accuracy won't last as long.

    All that being said, if you want a barrel you can hammer the f' out of, chrome lined hammer forged would be my choice. If I wanted to shoot bugholes as accurately as possible, cut rifled.
    Last edited by bp7178; 06-17-14 at 22:13.

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