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Thread: Colt SP6920 variations ??????

  1. #21
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    Quote Originally Posted by markm View Post
    It's like "pencil thin"... refering to barrel diameter. It's the gay fad of late.
    Huh. So the original barrel diameter was "gay"? And seems to me that the so-called "pencil" barrel has been around a lot longer than the M4 profile. To me, the M4 profile is the stupidest ****ing idea in the history of firearms stupid ideas. So you make a barrel heavy for stiffness and as a heat sink. Then, to save weight, you shave the barrel close to the receiver, which adds weight to the moment arm, and removes strength to where it is needed, thereby making the barrel less stiff, and more subject to heat distortion than the original thinner profile barrel. THAT is just ****ing retarded. And typical of military bureacratic idiocy.

    Combined with your post about irons being faster than RDS in another thread, I can now safely take your posts with a very large grain of salt.

    Quote Originally Posted by deadlyfire View Post
    I really don't care about the rollmarks. I realize some people like it and some don't.

    As for the pencil barrels, I don't think I called anyone a name, heck I don't really know much about it other than what was said.
    if it is a fad, then in my opinion, it's not a very good one, that's all I said.

    I ask these questions that may come off sarcastic because I'm not familiar with the private ownership of AR15s or the culture therein. I carry an M4 but that doesn't mean I'm familiar with why magpul lowers are so expensive.
    Why do you think pencil barrels are not good?

    First, with a semi-auto AR, there are very few occasions when you will ever heat up a barrel to make it shift POI.

    Second, thin profile barrels cool off more quickly than thick profile barrels.

    Third, the M4 profile is retarded, as I 'splained earlier.

    Fourth, removing weight from the front of the carbine improves handling and target acquisition more than you can imagine, until you handle one.

    I grew up with the M16/M16A1 and still think there was very little wrong with the original ones; but accept the flattop/RDS/new furniture as an improvement.

    deadlyfire, your question/statement was cool. And provided a context where we could discuss the "whys". Markm is the one that chose to go "full retard".

  2. #22
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    Part of me is glad this happened because it shed a lot of light onto different types of barrel profiles. To be honest I use/used the M4 but had no idea the profile of the barrel was constructed like that, never really took the time to notice I suppose.
    I'd love to discuss it more but you've left me with very little to say, or even play devil's advocate with.

  3. #23
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    Quote Originally Posted by deadlyfire View Post
    Part of me is glad this happened because it shed a lot of light onto different types of barrel profiles. To be honest I use/used the M4 but had no idea the profile of the barrel was constructed like that, never really took the time to notice I suppose.
    I'd love to discuss it more but you've left me with very little to say, or even play devil's advocate with.


    Here's a pic of the M4 Barrel profile.



    Here's a pic of my Daniel Defense light (aka "pencil") barrel profile.



    Just for frame of reference.

    I look forward to someone coming back with a counter to my points. I would especially like some objective data to either refute or back my claims.

  4. #24
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    The m4 barrel profile doesn't make sense to me, why the three sections like that?

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    Quote Originally Posted by deadlyfire View Post
    The m4 barrel profile doesn't make sense to me, why the three sections like that?
    It's my understanding that the grenade luanchers fit the pencil barrel profile. So instead of changing the grendae luanchers it was easier to machine the cut in the M4 barrel profile to accomodate the luancher. But, why have the heavier part of the barrel on the end to begin with...beats me.

  6. #26
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    just one more thing I will never understand about the army =P

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    Quote Originally Posted by 120mm View Post
    I look forward to someone coming back with a counter to my points. I would especially like some objective data to either refute or back my claims.
    I don't think there is much to refute, as you haven't come up with any new real revelations, or anything that hasn't been discussed here before.

  8. #28
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    Quote Originally Posted by markm View Post
    It's like "pencil thin"... refering to barrel diameter. It's the gay fad of late.
    Hmmm.... I have 4 of them now.


    I don't know how I'm going to break this to the Missus.

  9. #29
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    I always have to keep up with the "gay fads" too.
    Combat veteran
    Lifetime NRA member

  10. #30
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    I hope I'm not deviating too far from topic here, but do heavier profile barrels last longer in terms of round count? I know that pencil barrels heat up faster, but also cool faster. For regular semi-auto fire, would a BCM regular profile barrel last longer than a pencil barrel?

    As far as Colt goes, I often wonder why they still make the 6721 with the 1:9 barrel instead of 1:7?

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