AR15.Com Archives
 real world experience with melonite barrels?
DanTSX  [Team Member]
11/20/2011 8:42:09 AM EST
Have a friend buying a Troy M7 upper. They have melonite barrels. Any experience in the accuracy dept? He is going to be using the gun for a little bit of everything. He is looking forward to some bench time with hand loads, so looking at 100 and 200 yard accuracy too.
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jdubya87  [Team Member]
11/20/2011 8:52:17 AM EST
tagged. thinking about having some chrome moly carbon steel barrels melonited vs. buying chrome lined.
KasperC  [Member]
11/20/2011 6:08:50 PM EST
I too would like to know more. I have a non chrome 20" pencil barrel that I would like to get some additional protection for. Accuracy is not my foremost concern. Would this add some degree of longevity over the plain steel bore?
Blain  [Member]
11/20/2011 6:23:40 PM EST
Yes, and by some accounts, more longevity than chrome.
DanTSX  [Team Member]
11/22/2011 12:02:16 PM EST
Anyone else?
lorazepam  [Member]
11/22/2011 12:55:26 PM EST
Dan, shoot an email to the guys at DSA. they have extensively tested the "melonite" barrels for accuracy and barrel life. I think they will be able to answer your questions. I have one of their uppers, a mid length, but have limited rounds through it, so I cannot answer how long it will last.
It is not a coating, like chrome, but actually becomes part of the metal, and makes for a very hard surface. I can say that they are easy to clean and accurate. It will probably replace chrome lining someday, but old habits die hard.
308Sako  [Member]
11/22/2011 12:57:16 PM EST
I have a Rock Creek 5R 1 in 8 twist fluted under the handguards barrel chambered by Jim Ruiz at Predator Customs in Knoxville TN and QPQ'd by Joel Kendricks firm. It is an 18" rifle gas, AAC miter mount and a Noveske Switchblock. As you can see the "finish" is nicely matched for the other parts. What the barrel does do is clean with amazing ease. As to wear, I currently have about 1,700 rounds through it and there is no perceptible wear. Accuracy (precision to some) is actually beginning to get better, consistently under 3/4 MOA. Frankly I had hoped for better.




BigBore45  [Team Member]
11/22/2011 3:00:03 PM EST
dumb question. does the melonite treatment include the chamber and bore?
jdubya87  [Team Member]
11/22/2011 4:32:52 PM EST
Originally Posted By BigBore45:
dumb question. does the melonite treatment include the chamber and bore?


From what I understand, yes. Supposedly everything is hardened. So, in theory, do whatever profiling, pinning, etc you're going to do before the refinish. Also, I have read that the inital coating leaves a rough interior in a bore that will polish up and be more accurate over time. This is all internet hearsay, so don't quote me.
maleante  [Team Member]
11/22/2011 6:01:07 PM EST
Originally Posted By jdubya87:
Originally Posted By BigBore45:
dumb question. does the melonite treatment include the chamber and bore?


From what I understand, yes. Supposedly everything is hardened. So, in theory, do whatever profiling, pinning, etc you're going to do before the refinish. Also, I have read that the inital coating leaves a rough interior in a bore that will polish up and be more accurate over time. This is all internet hearsay, so don't quote me.


I have an ARPerformance 6.8 barrel. The entire barrel is nitro-carburized (melonited). My bore and chamber had no roughness at all. Obviously my fingers don't fit in the bore/chamber but I can say that the outside of the barrel is the smoothest barrel I have ever had. The nitro treatment (melonite) is definitely different than chromelining, stainless steel, chromemoly, bluing or parkerizing, but I really like it and my barrel is exceptionally accurate.

An interesting quality of nitro carburizing is that the barrel is REALLY deep black in color.

I can't comment on other manufacturers or other similar processes, but from my experience with ARPerformance, that barrel is awesome.



maleante  [Team Member]
11/22/2011 6:04:01 PM EST
Originally Posted By Blain:
Yes, and by some accounts, more longevity than chrome.


QPQ is process of nitro-carburizing (melonite treating)

Graph from ARPerformance.

B_D  [Member]
11/24/2011 6:31:20 PM EST
Who can do QPQ/nitro-carburizing/melonite treating to a chrome-moly barrel? What's a typical cost?

Thanks,
BD
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