Has anyone experienced gas tube erosion with a carbine gas rifle?

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[ARCHIVED THREAD] - Has anyone experienced gas tube erosion with a carbine gas rifle?

Posted: 4/11/2007 7:46:20 PM EDT

I've heard that due to the higher pressure gas,entering the gas tube, with the carbine gas rifles; tube erosion is common. Is this true or a myth? Has anyone personally experienced this?
Thanks.

Posted: 4/11/2007 9:12:35 PM EDT

[#1]

Anyone?

Posted: 4/11/2007 9:47:21 PM EDT

[#2]

I have heard of gas port erosion, on the barrels of weapons with a high round count.

Posted: 4/11/2007 10:06:03 PM EDT

[#3]

Quoted:
I have heard of gas port erosion, on the barrels of weapons with a high round count.

Maybe it's a good idea to replace the gas tube every 10,000 rounds or so? Wait a minute; isn't the useful life expectancy of a barrel around 10-15,000 rounds anyway?

Posted: 4/11/2007 10:30:09 PM EDT

[#4]

Only on CMMG uppers

Really I don't think its an issue.

You likely wear out many other moving parts before the tube.

Posted: 4/12/2007 5:58:45 AM EDT

[#5]

I think you mean gas port erosion, not gas tube erosion. On the shorter gas systems, the higher pressure of gas at the port means that erosion happens more quickly, causing the port to enlarge and feeding the system even more gas. Generally though you need a fairly high round count (>10k) and some hard use to get that.

Posted: 4/12/2007 9:03:06 AM EDT

[#6]

Quoted:
I think you mean gas port erosion, not gas tube erosion. On the shorter gas systems, the higher pressure of gas at the port means that erosion happens more quickly, causing the port to enlarge and feeding the system even more gas. Generally though you need a fairly high round count (>10k) and some hard use to get that.

And usually, a high volume of full auto fire. I suppose it can happen on a semi only piece, but I'd suspect it would take thousands of rounds more. The heat of full or continual rapid semi auto fire imposes a lot more wear than the same number of rounds fired semi auto at slow to medium rate.

Posted: 4/15/2007 11:22:04 PM EDT

[#7]

Gas PORTS erode forward on the inside of the barrel, more so on carbine gas systems due to the higher port pressures.
This erosion eventually makes the port larger, which makes the gun slightly over-gassed.
Swapping in a heavier buffer is the easy patch for this problem.

I have never heard of gas TUBE erosion being a problem except when the barrel nut is mis-aligned...

LMT MRP barrels actually have a gas port drilled into the barrel at an angle that SHOULD drastically reduce erosion, allowing the guns to run the same way they do when new for a MUCH higher number of rounds.

Posted: 4/15/2007 11:26:27 PM EDT

[#8]

Quoted:

Quoted:
I have heard of gas port erosion, on the barrels of weapons with a high round count.

Maybe it's a good idea to replace the gas tube every 10,000 rounds or so? Wait a minute; isn't the useful life expectancy of a barrel around 10-15,000 rounds anyway?

No, more like 20-30,000.

Never had a gas tube erode. On the other hand, gas tubes are cheap and easy to replace.

Posted: 4/16/2007 12:40:09 AM EDT

[#9]

I had one gas tube erode and fall out of the front sight assy.
It was on a 10.5 heavy barrel on an M16 that saw lots of Beta mag dumps
It finally failed after 20-21K rounds, almost all full auto.
Pat
0-1-25

Posted: 4/16/2007 7:10:30 AM EDT

[#10]

Quoted:

LMT MRP barrels actually have a gas port drilled into the barrel at an angle that SHOULD drastically reduce erosion, allowing the guns to run the same way they do when new for a MUCH higher number of rounds.

Are there any drawbacks to this? In other words, why not drill all gas ports this way (instead of just MRP barrels)?

Justin

Posted: 4/16/2007 7:56:38 AM EDT

[#11]

Quoted:
Maybe it's a good idea to replace the gas tube every 10,000 rounds or so?

If you could get the old one off.

Wait a minute; isn't the useful life expectancy of a barrel around 10-15,000 rounds anyway?

If you abuse the shit out of the barrel you may only get 10-15k out of it. My oldest barrel (10+ years old) doesn't even have any visible throat errosion in it. Not sure on the round count, but I don't do any retarded mag dumps or any such nonsense.

Posted: 4/16/2007 6:16:29 PM EDT

[#12]

Quoted:
why not drill all gas ports this way (instead of just MRP barrels)?

It's more difficult to drill a hole at an angle.

Posted: 4/18/2007 7:34:57 AM EDT

[#13]

Quoted:

Quoted:
why not drill all gas ports this way (instead of just MRP barrels)?

It's more difficult to drill a hole at an angle.

Oh, OK.

Do you offer this on your custom barrels?

Posted: 4/18/2007 7:44:18 AM EDT

[#14]

All AR guns experience gas port erosion.

It's just a matter of degree, depending on the gas system involved, and the round count, and the way it is used(full or semi).

You might notice it, or you might not, depending on how sensitive you are to the gun's cycling behavior.

Posted: 4/18/2007 6:05:35 PM EDT

[#15]

Quoted:

Quoted:
why not drill all gas ports this way (instead of just MRP barrels)?

It's more difficult to drill a hole at an angle.

Oh, OK.

Do you offer this on your custom barrels?

I alomost forgot to ask, would a standard gas tube be compatible with an angled gas port?

Posted: 4/18/2007 9:25:16 PM EDT

[#16]

I've heard also that AR barrels loose much of their accuracy around 12-15,000 rounds.

[ARCHIVED THREAD] - Has anyone experienced gas tube erosion with a carbine gas rifle?

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