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P226 barrel corrosion?

This is a discussion on P226 barrel corrosion? within the SIG Sauer Pistols forums, part of the SIG Sauer Forum category; I am trying to find some help with what I think might be possible corrosion within my P226 barrel. It is a MK25 that I ...


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Old 02-21-2016, 01:33 PM   #1
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P226 barrel corrosion?

I am trying to find some help with what I think might be possible corrosion within my P226 barrel. It is a MK25 that I have owned for a little over two years. I am no gun expert by any means, but I still clean my guns after every use and even when they have sat for too long.

That being said, upon my purchase of this gun I noticed this "rusty" appearance to the last 1/4 inch of my barrel. With my lack of experience, I first thought it was some left over copper from the factory test fires so I thought nothing of it. I decided to try and shoot and clean it out with my next couple of range sessions but the color has remained. I usually clean my guns with Break Free CLP spray and that did nothing to the barrel. I have since used Hoppe's Bench Rest Copper Remover and Sweet's 7.62 Solvent with hopes that the discoloration was still copper fouling - all of these chemicals have had no success.

I have attached two pictures of the barrel, they are the best angles I could get with my phone. Has anyone seen this before? I am calling Sig Sauer tomorrow to see if they will be any help, but I was hoping to get others opinions who may have dealt with this same discoloration before. Thanks guys.
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Old 02-21-2016, 02:10 PM   #2
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I would try Hoppes, leave in the barrel wet for 30 minutes, then run a brass brush back and forth a few times, then pull a snake through it and see how it looks. It should be nice and shiny, with no pitting in the grooves. You may have to repeat the process more than once. The picture looks like copper to me.


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Old 02-21-2016, 02:29 PM   #3
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I think that is just copper fouling, I noticed that in both the M11 and the Mk25 with the phosphate barrels. Shooters Choice cleaned it up for me. I think it was how the barrels were dipped because they both had that at the end of the barrels.
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Old 02-21-2016, 02:52 PM   #4
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Your MK25 barrel is not chromelined?
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Old 02-21-2016, 03:38 PM   #5
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I had a hard time getting the copper fouling out of my MK25 barrel as well, let it go nearly 1,000 rounds before going after the copper. Lots of short soaks with Copperzilla and plenty of strokes on the brush finally got it. I've been told some cleaners can damage the chrome lining if left too long so I concentrated on lots of elbow grease. I clean a bit more often now and that has seemed to prevent it from looking like that again.
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Old 02-21-2016, 05:41 PM   #6
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OP you had mentioned that the barrel had this discoloration when you first purchase the Sig and thought is was copper fouling from test fires. I can see how you may come to that conclusion. But what bothers me, does Sig do enough test fires on a barrel to create this much fouling and them not remove the fouling before the firearm is boxed up for sale?
I think markm may be on to something with the way the barrel was processed. It's od that both the lands and grooves have the copper look, usually fouling is more prominent in the grooves than the lands of the barrel. It appears that your barrel is phosphate coated and not chrome lined from what I can decipher from your pictures. Which I learned from a couple of other threads in this forum that Sig did produce both chrome lined and phosphate coated barrels for the MK25 and M11-A1.
Please let us know what Sig CS comes back with after your discussion. I'm really curios and I hope they work things out for you.

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Old 02-21-2016, 10:59 PM   #7
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Quote:
Originally Posted by SirKnight View Post
Your MK25 barrel is not chromelined?
I don't know if they are chromed but I do know the phosphate seemed to build or pool up at the muzzle and catch a lot of copper, after a lot of cleaning and some shooting it doesn't do it any more.
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Old 02-21-2016, 11:03 PM   #8
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Email sig thats why they have a lifetime warranty.

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Old 02-22-2016, 01:50 AM   #9
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I'm pretty sure the phosphate coating is only used on the outside of the barrel with chrome used on the inside.
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Old 02-22-2016, 02:00 AM   #10
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Shoot it more, you'll notice it less.
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Old 02-22-2016, 04:32 AM   #11
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Looks like mine

Quote:
Originally Posted by SirKnight View Post
Your MK25 barrel is not chromelined?
I purchased my MK25 in Aug 2015 brandy new and it definitely does NOT have a chrome lined barrel. OK by me though. May not be relevant but when I slugged it, the bore measured out to .3562"
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Old 02-23-2016, 03:02 PM   #12
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Thanks for the replies. I am not stressing too much on it, but I will still try some of the recommendations to clean it up with the different brand cleaners.

Either way, I have since contacted Sig and sent them the pics - I'll be sure to let you guys know what they think.
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Old 02-23-2016, 05:21 PM   #13
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Try JB bore paste, if you have Kroil add some Kroil to the JB bore paste to thin it down a little. It works,high power shooters and bench rest shooters use it.
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Old 02-24-2016, 07:57 PM   #14
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no corrosion. all my barrels look like that and I clean them after every range trip. not sure what that brown is?
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Old 02-25-2016, 02:39 AM   #15
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Heard back from Sig yesterday morning. They sent both pictures to one of their gunsmiths, their response was that it was copper fouling. Seeing as how I've already tried some copper remover with little to no improvement, I requested to know what copper remover they recommend. At this point I'm not to concerned, will just keep doing what I'm doing and just make sure things don't get any worse... thanks for the help guys
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