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Thread: Measuring the barrel gas port size

  1. #91
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    Quote Originally Posted by rob_s View Post
    I have no doubt that an outfit the size of DD or Colt can order a reamer in the specific size that they need
    Anybody can custom order reamers or drill bits in the specific size(s) they need.

  2. #92
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    Quote Originally Posted by EzGoingKev View Post
    Anybody can custom order reamers or drill bits in the specific size(s) they need.
    That's true, but it's more cost effective to use existing tooling. There are drill bit sizes that run in fractions, letter sizes, number sizes and metric. Then there are core drills which come in sizes standard drills do not. Then there are reamers. They also come in sizes not available in drill sizes or core drills. Between the three types, many diamters are available without ordering custom reamers.

    When it comes to drilling close tolerance holes, there are problems with staying in tolerance and staying in control. Depending on drilling method and tool quality, the actual hole can be larger or smaller than the tooling. However, I doubt the tolerances of the gas port holes are very tight
    Last edited by MistWolf; 02-11-12 at 20:36.
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  3. #93
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    Carbide reamers tend to do pretty good cutting to size, but that isn't any guarantee. The way metal machines varies from batch to batch, even if its the same specified, certified material and the same specified heat treat. Metal is funny that way. I suppose the closest analog I can provide is variation between different ammo lots, even if its high grade match ammo.

    Special tooling can be expensive...very expensive. likewise, special tooling will tend to vary between batches much more than standard production tooling.
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  4. #94
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    16" Bushmaster super lightweight

    I recently got a the above barrel for g/fs lightweight build. I drove out the tapered fsb pins and used a #52 drill bit which is. 0635 to measure the gas port and it fit nice snug. Anyone measure a Bushy L/W gas port?And would this gas port size be considered over gassed?Thanks

  5. #95
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    Quote Originally Posted by MistWolf View Post
    However, I doubt the tolerances of the gas port holes are very tight
    The barrel for the M16A1 calls 0.092" + 0.001".

    Quote Originally Posted by archad View Post
    And would this gas port size be considered over gassed?
    Does it behave like it's overgassed?

  6. #96
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    I have not fired round of it yet. I just read on m4c that bushmasters are over gased. I was just wanting to know if anyone has ever measured a 16" l/w with a carbine length gas system. I'm going run a H buffer.

  7. #97
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    It's usually best to shoot it then decide if it needs to be modified.

  8. #98
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    Nice timing...I was rummaging through the parts bin to put together a rifle on an FN CHF M4-ish profile 16" car gas barrel I've had laying around, and on closer inspection, the gas port looked HUGE...like enormous. I did a double take. It accepts a 3/32" drill bit, snug...so that's .094", give or take.

    It's like someone drilled a carbine barrel with a rifle gas reamer, and was sloppy about it. Not sure what to do with this thing now. I grabbed this thing in some horse trading a long while back and never even messed with it. I'm half tempted to put it together just to see how bad it will be--but only half tempted.

    Anybody ever see anything this far on the large side?
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  9. #99
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    I would put it together and shoot it. When you say "CAR" I hear 11.5" with 5" faux suppressor. Am I correct?
    Last edited by Tweak; 07-31-12 at 11:59.

  10. #100
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    Quote Originally Posted by Tweak View Post
    I would put it together and shoot it. When you say "CAR" I hear 11.5" with 5" faux suppressor. Am I correct?
    No, '16" car gas barrel' was me being lazy instead of typing '16" barrel for carbine length gas system'...so it's a .094" gas port located 8 3/8" from the muzzle of a 16" barrel set up for carbine length gas with a .750" dia at the block.
    Duane Liptak, Jr.
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    Magpul Industries

    info@magpulcore.com

    This is a personal account linked to a personal e-mail. Company affiliation and titles are provided purely for transparency requirements of the host site. Although factual company information may be shared through this account, any opinions expressed are solely those of the account holder, and not necessarily those of Magpul Industries or subsidiaries.

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