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11-10-2016, 07:19 PM
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gas tube
Hey guys,
Dumb question for you. Other than the gas tube pin there aren't any O-rings or anything I need to watch out for if I take the gas tube out is there? Also what size punch do I need to remove the pin?
Thanks
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11-10-2016, 09:03 PM
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There aren't any O-rings, there's a tiny hole at the bottom of the tube that matches the hole in the sight base. IIRC, 0.060" on the pin punch.
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11-10-2016, 09:19 PM
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o-rings would melt in there, if there were any...
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11-10-2016, 10:26 PM
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Yeah rubber or plastic in that area ain't gonna work. So no, just line up the holes.
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11-11-2016, 12:16 PM
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Well, made with the right material they wouldn't melt on an AR.
Perfluoroelastomer is good up to 500°F. Pretty sure my AR doesn't get that hot. Now if it were full auto...
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11-12-2016, 12:46 AM
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Quote:
Rastoff wrote:
Perfluoroelastomer is good up to 500°F. Pretty sure my AR doesn't get that hot.
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Don't confuse the temperature of the propellant gasses with the temperature of the gun barrel.
See this article, for example, showing that the temperature of the propellant gas in the subject Army projectiles was 3,000 degrees Kelvin. This is 37mm round, but it is using a double-base propellant just like the smokeless propellants that handloaders use, so the combustion temperature would be similar - certainly well in excess of 500 degrees.
http://www.arl.army.mil/arlreports/2005/ARL-MR-624.pdf
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11-12-2016, 01:28 AM
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Well that's interesting. I don't know what the propellant gas temperature is from a .223Rem or 5.56 NATO round. However, I can measure it. Maybe I'll do just that. I suspect it's nowhere near 4,940 deg F. If it were, why doesn't the aluminum gas tube melt?
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11-12-2016, 09:31 AM
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Quote:
Originally Posted by Rastoff
If it were, why doesn't the aluminum gas tube melt?
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Probably because it's stainless steel, not aluminum.
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11-12-2016, 12:37 PM
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The gas tube will eventually melt if one fires enough rounds in succession, or at lease it is supposed to prevent catastrophic failure of the rest of the firearm. In practice that doesn't always work. Iraqveteran8888 did a fire to failure test on an M-16/AR-15 and it did not fail at the gas tube by at the barrel by the gas block.
I can't find the video in a quick search but that is the general gist of what they found.
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11-12-2016, 11:30 PM
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None of this really matters. The gun doesn't melt and doesn't have o-rings around the gas tube.
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Last edited by Rastoff; 11-12-2016 at 11:35 PM.
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11-15-2016, 12:04 AM
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