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Thread: Why do mfgs still make carbine length gas systems?

  1. #101
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    A 'dissy' is a dissapator, with rifle length handguards and sight radius but a 16" barrel; the name supposedly because the full coverage of most of the barrel dissipates barrel heat without a chance of toasting your hands.

    Mine has a gas block about 6.5" from the muzzle, or approximately the same distance as the gas block to the muzzle of a 20". My pinned 16.5" has the gas block about 7.5" from the muzzle (sorry for the 'abouts' but the FH makes it challenging to measure perzactly).

    So, unless I'm missing something, the claim to fame of systems such as this one is the same dwell time for the bullet downbore from the gas port, tho' it does place the gas port closer to the chamber and, I suspect, somewhat higher pressures.

    I got a tentative zero on the dissy today, with mixed results. A decent group at 50 yards, off the paper at 100, and beating the living hell out of a 10"x18" clanger at 200 yards (this with 65 year old eyes and XS irons, and green tip NATO). I put it on a Government Carbine lower because that has an SSA in it, tho' the carbine buffer remained as well. The carrier is ramped and not full circle, so it is a bit lighter than standard.

    It was pleasant enough shooting, tho' I experienced no epiphanies; we'll see how it all works out. Function was 100%, tho' it required a full stroke to chamber the first round; it does have M4 feedramps. It is about 7lbs, so it's heavier than an A1 or a Government Carbine.
    Moon

  2. #102
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    Thanks Moon.

    NYH1.

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  3. #103
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    Moon, if you measure from the other end (chamber) is the gas block closer to a carbine or mid-length? If either?

    Thanks, NYH1.

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  4. #104
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    NY, on a quick eyeball, it appears the gas block on the dissy is the same distance from the chamber as the front sight is from the chamber on the carbine.
    Moon

  5. #105
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    Quote Originally Posted by halfmoonclip View Post
    NY, on a quick eyeball, it appears the gas block on the dissy is the same distance from the chamber as the front sight is from the chamber on the carbine.
    Moon
    Thanks, NYH1.

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  6. #106
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    Quote Originally Posted by TMS951 View Post

    They're are plenty of threads of people having problems with 14.5" mids, even from good manufacturers.
    I ran a mid length gas tube on a 13.7" White Oak barrel with a KX3 for years, never had a hiccup.

  7. #107
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    The first Dissipator I saw was back in the 90's and it used a 16" barrel with a rifle length gas system with an FSB. I forget if it was a Bushmaster or Rock River. Since then, "Dissies" have been made with either carbine or mid length gas system and the FSB mounted at rifle length.

    As for myself, I've always thought the dissy was an ugly beast until I saw one with MOE furniture. If I needed a carbine with solid fixed sight with a longer radius, I'd get one. But I think a carbine with a modern RDS, free float tube with BUIS is more practical
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  8. #108
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    The first "Dissipator" was probably the Colt 605A developed back in 1964, although it was cataloged as a "CAR-15". It, like the Colt 6536 that would come along 40 years later were basically 20" rifles with the barrel cut back to 15 or 16 inches - they used the standard rifle length gas system; I had a configuration like this in the early 80s but IMHO it was too finicky.



    Bushmaster resurrected the idea with their Dissipator, however they used a carbine length gas system and had a low profile gas block hidden under the handguards... wherein the front sight base was now only a front sight and attachment point for the handguards.

    This same idea has been built be various people using the mid-length gas system hidden under the handguard... I think this is a very slick setup for a simple iron sight rifle.

    I used the later "dissy" concept when I came up with the "Kino Config" for BCM. (I didn't name it, Paul did)

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  9. #109
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    ^^^

    Thanks for posting the vintage photo!

  10. #110
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    Quote Originally Posted by N.Franklin View Post
    I ran a mid length gas tube on a 13.7" White Oak barrel with a KX3 for years, never had a hiccup.
    The KX3 was designed to add more back pressure in addition to send the concussion forward. As far as the gas system is concerned a KX3 makes it seem like a longer barrel, much to the same effect as a suppressor.

    I doubt you would have had the same results with an A2 on there instead of the KX3.

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