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Is ar 556 barrel nitrided for standard model?

This is a discussion on Is ar 556 barrel nitrided for standard model? within the Ruger Semi-Auto forums, part of the Rifle & Shotgun Forum category; I emailed Ruger and here is their response Thank you for your inquiry. The AR-556 barrel has a melanite nitride treatment on the inside and ...


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Old February 27th, 2020, 10:59 AM   #16
 
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I emailed Ruger and here is their response

Thank you for your inquiry. The AR-556 barrel has a melanite nitride treatment on the inside and a black oxide coating to provide corrosion resistance. There is no other coating on the rifling of the barrel.


Nitrided barrel should be applied to whole barrel, inside and outside, right? not quite believe what he/she said. 😛 Anyway Ruger probably does something to the CHF barrel, I believe they know what they are doing to compete with other companies with nitrided barrel.



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Old February 27th, 2020, 11:43 AM   #17
 
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I don't buy into to the barrel life crap! I work as a gunsmith part time for a guy who has been a smith for 30+ yrs and the only time he has ever seen one wear out was because of extended full auto use!
ALSO, while in the Marines for 8 glorious yrs 95-03, we had M16A2's issued to us and they were from the 80's, issued countless times, god knows how many rounds fired through them (we fired a couple thousand a year, start doing the math) and they had the happy switch!!! Guess what, they were still accurate enough to qualify expert everytime all the way out to 500 meters!

Military M16A2s/M4s and the equivalent ARs are chrome lined.

Melonite is a chemical hardening process that does not build a coating, it treats the underlying steel. It makes the steel harder and more corrosion resistant.

I have done a fair amount of research on this and from what I gather.

Chrome>Melonite>hammer forging>cut rifling in order of durability. Then reverse the order for accuracy. I doubt most will shoot out any of them.

There is a great thread on ARForum.com "high round count M16/M4s" or something close to that title, where a full auto range in Las Vegas has sent many of the common ARs to failure. What breaks, whose AR breaks, and when it breaks is quite interesting.

Spoiler alert, the expensive ARs do not fair much, if any, better than cheaper ones. PSA in particular has held up very well. Another interesting fact, the expensive piston guns fail much quicker than the good old DI guns.

Last edited by Corndog; February 27th, 2020 at 11:45 AM.
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Old February 27th, 2020, 12:43 PM   #18
 
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Was Ruger in the mix?
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Old February 27th, 2020, 12:50 PM   #19
 
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Originally Posted by pennsy View Post
Was Ruger in the mix?
I assume you directed this at me?


Not that I recall. All of them were converted to full auto.

Colts, PSA, Daniel Defense, LMTs......others I am sure I missed. Lots of classic firearms to.

Shotguns - only Benelli M4s held up, Remingtons and Mossbergs fell apart.

Glocks - held up very well.

1911s - fall apart pretty quickly.
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Old February 27th, 2020, 01:19 PM   #20
 
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I'll have to read that , thanks.
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Old February 27th, 2020, 04:30 PM   #21
 
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Why would you nitride the inside of the barrel and not the outside? I bet it isn't nitrided.
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Old February 27th, 2020, 05:10 PM   #22
 
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Now I know why I did not pass chemistry class. Mixed up the nitride/oxide in my response.
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Old February 27th, 2020, 06:58 PM   #23
 
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First, barrels don't "wear out" suddenly. They gradually eroded at the throat and accuracy gradually declines.
My experience in burning out barrels has been the opposite. Generally, they’ll run fine, then suddenly make a step change, especially following a cleaning (ESPECIALLY if a guy makes the mistake of pushing out copper too, instead of just powder), they’ll take a huge dump in velocity, and/or jump in group size. They’ll hang on a while again, then take another dump. Almost like walking down stairs once it starts, with the stairs getting progressively taller and taller, falling off almost as if exponentially.

There’s more than one way for a barrel to “die,” meaning multiple tolerance standards for that which defines “death.” In a game with unlimited sighters, at fixed distances, and with relatively low round counts, there’s not as much demand for stability. In games with high round counts and highly variable ranges, with no sighters, the tolerance is tighter. In Service Rifle, I was satisfied with a barrel holding 1moa, and a barrel could run 3,000-4,000 rounds, finishing an entire season with ease. In long range benchrest, any barrel slipping over 1/3MOA wasn’t going to compete, but I didn’t need to track velocity as closely as I do for PRS competition (at all really, I shot with some guys which didn’t even own chronographs). In PRS, as soon as a barrel starts bleeding velocity, we have to change out, because a barrel losing 20fps per hundred rounds could mean significant misses at range in our score on a second day of a match.
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Old February 27th, 2020, 07:16 PM   #24
 
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Originally Posted by iloverevolver View Post
The AR-556 barrel has a melanite nitride treatment on the inside and a black oxide coating to provide corrosion resistance. There is no other coating on the rifling of the barrel.

Nitrided barrel should be applied to whole barrel, inside and outside, right?
No, no reason to. Nitriding on the inside is there for wear resistance and to improve durability. There is no real need on the outside and the black oxide outside is just to inhibit rusting.
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Old February 27th, 2020, 08:15 PM   #25
 
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Originally Posted by GP Fan View Post
No, no reason to. Nitriding on the inside is there for wear resistance and to improve durability. There is no real need on the outside and the black oxide outside is just to inhibit rusting.
Still For salt-bath nitriding, barrel is submerged, meaning apply to whole.
Maybe, other nitriding method ( gas? ) can apply to inside only.
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Old February 28th, 2020, 05:39 AM   #26
 
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Originally Posted by RooGerDooger View Post
Why would you nitride the inside of the barrel and not the outside? I bet it isn't nitrided.
$
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Old February 28th, 2020, 05:41 AM   #27
 
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Originally Posted by iloverevolver View Post
Still For salt-bath nitriding, barrel is submerged, meaning apply to whole.
Maybe, other nitriding method ( gas? ) can apply to inside only.
Strictly a financial decision.

Melonite can be performed on any surface. But it is more expensive.

Melonite inside and the black oxide is fine.
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Old February 28th, 2020, 05:42 AM   #28
 
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Originally Posted by Corndog View Post
Another interesting fact, the expensive piston guns fail much quicker than the good old DI guns.
Any hard data to back up that assertion?

Everything I have read indicates that piston provides better longevity as less gas is introduced back to the chamber and bcg. Which from an engineering standpoint is common sense.
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Old February 28th, 2020, 06:03 AM   #29
 
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Originally Posted by oldag View Post
Any hard data to back up that assertion?

Everything I have read indicates that piston provides better longevity as less gas is introduced back to the chamber and bcg. Which from an engineering standpoint is common sense.
Watch the “meltdown” videos on the Iraqveteran8888 YouTube channel. He takes various AR uppers, puts them on full auto lowers and shoots them as fast as he can until something breaks. The piston uppers he has tried have tended to not last as long as the DI versions. Not scientific, as it’s a very small sample, but it’s still real data.
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Old February 28th, 2020, 09:58 AM   #30
 
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Originally Posted by oldag View Post
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Originally Posted by iloverevolver View Post
Still <img src="https://rugerforum.net/images/smilies/confused.gif" border="0" alt="" title="Confused" class="inlineimg" /> For salt-bath nitriding, barrel is submerged, meaning apply to whole.
Maybe, other nitriding method ( gas? ) can apply to inside only.
Strictly a financial decision.

Melonite can be performed on any surface. But it is more expensive.

Melonite inside and the black oxide is fine.
Thx, That makes sense. I also emailed Ruger to put more detail for their barrel treatment, if it is indeed nitrided barrel, they should mention it in the website!
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