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  1. #1
    Contributing Member CINDERS's Avatar
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    Hows this gas port

    Was looking for information on Fire cracking and throat wear and came across this one of a gas port that has been machined to expose the inside of the barrel I think they said M-16 she is rather sad that barrel.......
    Mind you that barrel has oodles of fire cracking.....



    2nd pic of some test barrels from the same page now they are really flogged out...................
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    Last edited by CINDERS; 05-03-2017 at 12:12 PM.

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    Contributing Member mrclark303's Avatar
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    Barrel Cinders, looks more like my leaf filled gutters, come to think of it my gutters probably have better ballistic properties that that barrel, the newness has certainly worn off!

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    Advisory Panel browningautorifle's Avatar
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    You can see how it started to erode from the first spot the gasses entered the gas port. Through time it enlarges...to that. Very interesting...
    Regards, Jim

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    Yep, certainly very interesting and does illustrate the point. Never saw such a good cutaway example. I bet there were flames whacking down that gas cylinder!

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    Really Senior Member Aragorn243's Avatar
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    Did it say anywhere how many rounds it took to get to that point? I've watched a few vids on the barrels where they fire full auto almost continuously and it doesn't take long to melt or burst them but the gas port is something different.

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    We did a similar test with the Dillon minigun trials where we just fired non stop until............. well...., something broke. And it did, big time. But the gun didn't stop. One of the barrels just disintegrated so due to the danger, WE stopped the gun!

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    Really Senior Member skiprat's Avatar
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    At my 1st Unit we had an Air Defense Battery that used to run the Divisional All Arms Air Defense course, 2 weeks of firing at radio controlled aircraft.
    Using the L37 version of the GPMG ( fixed gas regulator....So firing as fast as 1000 rpm) 24 guns for the whole Div. .... Inspection of the guns after the shoot I dropped the bore gauge 0.297 and it ran all the way through as it should...
    Then I dropped the 0.306 ( to measure throat erosion) it should not enter the barrel more than 4 inches (including the chamber) the .306 ran the full length of the barrel freely.

    We sectioned the barrel ( had nothing better to do for the week) there was no visible rifling in any of the bore, it looked more like the surface of the moon.
    The throat had opened up wider than the neck of the round, and the erosion was not even along the length of the bore, more like a series of bulges.
    The gun was still firing (all be a bit slower!) all the way till the last round down range

    At the start of the shoot the barrel was well within spec, as they were inspected every 6 months..

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    Advisory Panel browningautorifle's Avatar
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    The pics of the four M4 barrels are possibly combat failures, they had various...sand blockages, extreme heat failure, bolt locking lug failure...various that we might expect with educated guess. That's what they look like anyway, that was a while ago.
    Regards, Jim

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    Contributing Member CINDERS's Avatar
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    Found this table interesting.
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    Contributing Member mrclark303's Avatar
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    Quote Originally Posted by skiprat View Post
    At my 1st Unit we had an Air Defense Battery that used to run the Divisional All Arms Air Defense course, 2 weeks of firing at radio controlled aircraft.
    Using the L37 version of the GPMG ( fixed gas regulator....So firing as fast as 1000 rpm) 24 guns for the whole Div. .... Inspection of the guns after the shoot I dropped the bore gauge 0.297 and it ran all the way through as it should...
    Then I dropped the 0.306 ( to measure throat erosion) it should not enter the barrel more than 4 inches (including the chamber) the .306 ran the full length of the barrel freely.

    We sectioned the barrel ( had nothing better to do for the week) there was no visible rifling in any of the bore, it looked more like the surface of the moon.
    The throat had opened up wider than the neck of the round, and the erosion was not even along the length of the bore, more like a series of bulges.
    The gun was still firing (all be a bit slower!) all the way till the last round down range

    At the start of the shoot the barrel was well within spec, as they were inspected every 6 months..

    Its a credit to the designers at Fn that the thing was still rocking and rolling, even though effectively smooth bored Andy! Was the sectioned barrel kept, sounds like a great training aid...

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