Barrel lining - beyond chrome lining

[vicious_cb]

Well, those are, indeed, FN barrels. M249 type.

The old ones, some made 30 years ago, are still going strong but dozens of the new ones are keyholing after only a 2-3 thousand shots.

And it's true keyholing, with 25 rounds keyholing out of 30 shots fired at a 15m-away target.

Unless I missed it somewhere are you saying your FN CHF barrel lasted less than 3k? Which vendor did you buy it from? Who does the chrome lining just as or more important than lining itself.

[vicious_cb]

Never mind I found it. OP bought a turd and is dealing with the consequences.

There is nothing wrong with chome-lining and you do not need something "better", stop buying shit barrels and you wont run into this issue.

https://www.m4carbine.net/showthread...-ID-this-upper

This post is suspect. He posted elsewhere about some pseudo Colt turd that was purchased that wasn't really a Colt.

[TheFalconeer]

Nope, those are two totally different case.
The pseudo-Colt were assembled in Italy by a company called Prima Armi.

But the M249 barrels were provided by with Minimi MGs.

[vicious_cb]

Nope, those are two totally different case.
The pseudo-Colt were assembled in Italy by a company called Prima Armi.

But the M249 barrels were provided by with Minimi MGs.

So lets be clear, you have Minimi belt fed machine gun thats burning barrels in less than 3k rounds?

[TheFalconeer]

THAT. And not only one. At least a dozen.

Let's see what we have:

58462350_10218917113702004_2649223608714395648_n.jpg
57798776_10218917114062013_215986444957646848_n.jpg
57434145_10218917113461998_7530902704571285504_n.jpg

[georgeib]

Could you post some pictures of the weapons and the barrels, including the markings on the barrels please?

[hk_shootr]

Gents,

I am looking to go beyond hard chrome for barrel lining; having seen some problems with chrome-lined barrels recently. On dozens of 5.56 barrels, chrome is teared from throat & muzzle after roughly 3000 rounds...pretty disappointing.

So, I am studying the various "new" treatments now existing. Of course, there is nitriding, so widely used today. But is there anyone who tried Co-P-SiC coating ? (US patent US2012/0247962 A1)

I am not a chemist but, from what I understand, it would be a pretty good candidate to replace hard chrome for barrel lining.

It seems you have let out a bit of vital info.

Few barrels will hold up to 249 fire and not have a greatly decreased life
Suspect your simply burned them out, you are trying to compare apples to kiwi

[Eurodriver]

This thread is stupid.

[Wake27]

I as well. I haven't ever seen a chrome line barrel peel at any point. It isn't like cheap ass bumper chrome. I've seen them worn through and eroded away, but that was always pretty much past the 10K mark.

My Noveske barrel was doing it at 3k rounds. They acknowledged that it was a defect and replaced it, but it did happen.

THAT. And not only one. At least a dozen.

Let's see what we have:

58462350_10218917113702004_2649223608714395648_n.jpg
57798776_10218917114062013_215986444957646848_n.jpg
57434145_10218917113461998_7530902704571285504_n.jpg

Were all 3k of those rounds fired on cyclic without a single barrel change or period to allow the barrels to cool?


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[MegademiC]

If you are getting it hot, the substrate is eroding. No treatment or coating is going to make a big difference on that.

Chipping or peeling Cr is a production process issue and there is a lack of adhesion.