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9/22/2017 12:11:25 AM
Posted: 4/8/2006 3:08:27 PM EDT
I was reading the Black Rifle. Vols 1 & 2.

There was some discussion of Gas tube fouling with accompnying X-Rays of the tude allegedly showing fouling.

Has anyone ever experienced "Gas Tube Fouling"?
Link Posted: 4/8/2006 3:18:03 PM EDT
[Last Edit: 4/8/2006 3:18:59 PM EDT by peasant]
I think it's a myth. But, I could be wrong. I was . Once. Seriously, never noticed any when I've pipe cleanered my gas key.
Link Posted: 4/8/2006 4:01:05 PM EDT
I ran a pipe cleaner through my gas tube once after shooting about 3000 rounds and I didn't find anything in it, even after shooting some Wolf and Barnaul.
Link Posted: 4/8/2006 4:36:52 PM EDT
The general concensus is that its "self-limiting" in that the next jet of hot, fouled gas blasts the old crud right out.
Link Posted: 4/8/2006 4:40:11 PM EDT
It cleans itself and the back of the bolt does too. No need to scrape carbon.
Link Posted: 4/8/2006 4:44:52 PM EDT

Originally Posted By Boom_Stick:
It cleans itself and the back of the bolt does too. No need to scrape carbon.

The rear of the bolt will pit if it is not cleaned. The only places that are self-cleaning are the inside of the carrier, the gas tube, and the gas port.
Link Posted: 4/8/2006 4:51:02 PM EDT
Not a problem, at least not one that I ever came accross. With the amount of rounds I fired through M16's and AR's I haven't seen carbon in the gas tube cause any reliability problems yet.
Link Posted: 4/8/2006 5:03:49 PM EDT
I read, wish I could remember where, that the pressure is too high in the tube for fouling to form.
Link Posted: 4/9/2006 8:00:45 AM EDT
Those pictures are from the old style ball powder......Those of you sticking pipe cleaners in the gas tube....DONT!
Link Posted: 4/9/2006 3:12:29 PM EDT
The gas tube fouling occured with the original powder that the XM16E1 was tested with...they reduced the level of calcium carbonate in the powder and the problem went away.
Link Posted: 4/9/2006 3:58:23 PM EDT
Pressure over the gas port starts out at about 15,000 psi. Anything less than that can cause a short stroke malfunction.
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