M&P 9MM barrel crown rust.

ronliang

ronliang

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Has anyone have experience with their pistol having tiny rust spot on the crown of their pistol / gun barrel?? is this normal??

I cleaned my gun with G96 gun treatment after every gun range trip. and Use my silicone fine cloth to wipe the slide and all parts.

This is a new gun, own it for less than a year and 400rd (FMJ Winchester white box) down the pipe. Somehow the rust finds its way on the barrel crown. See picture below.

my google drive picture.
https://drive.google.com/file/d/0B_DxczqvM4z9VEtiUkpJdld3SGc/view?usp=sharing


Thank you all for all your comments that would help me out to eliminate this situation in the future.

Ron.
 
Have you checked the humidity level of your safe?
Also, from your pic, are you sure it's rust? Could be copper fouling from the bullets. Odd that only one spot of your barrel rusts.
I used G96 also and have never had issues with rust. Also, keep your safe humidity level below 50%.
 
I have silica pack around my safe to keep my items dry. There's no rust on other parts on the slide but the barrel crown.

I tried to use nylon brush and even a brass brush to lightly clean it up but that "rusty" spot is not going away. I think I'm going to use a 3000 grit 3m sand paper to gently sand it away.

any other idea how i can remove this "rusty" / copper fouling spot from the barrel crown??

Your input is greatly appreciated.

Ron.
 
Could it just be a blemish that came with the gun originally? Maybe you didn't notice it when you got it?
Also, just because you have silica packs in your safe doesn't mean the humidity levels aren't high. The packs can be saturated over time and won't soak up more moisture. You should get a hygrometer for the safe to measure the actual humidity level...to be sure.
I use 2 cans of silica in mine and they saturate in around 2 months time!
 
Looks like slight finish discolouration. Nothing to be concerned about if you don't see any metal damage. Should come clean with fine steel wool and oil.
 
That doesn't really look like rust to me from looking at the picture, I'd be more inclined to agree with gravel but it's hard to say without seeing it up close. I have an m&p9 and haven't seen any rust anywhere, I find the finish pretty tough on mine. If you rub it hard with a white paper towel does any of the tarnish transfer to the towel? I don't think I'd sweat it unless it starts to get worse or become pitted.
 
Do NOT use sandpaper or steel wool on the crown of your barrel. Any barrel. A nicked or scratched crown and the barrel is shot. Now on that note, is this discolouration all ways on the same spot? Are you sure it's rust and not copper ?
Either way, there is something not right about that barrel. Examine the rifling right at the crown with a magnifier and see if you can detect any abnormalities.
 
Butcherbill has a great idea of rubbing it hard with a dry paper towel. If you can press the towel against the mark and just skid the towel back and forth a slight amount then if it's actual corrosion it'll wear off and transfer to the towel as a reddish brown smudge. If it doesn't then it's something else.

Fine 000 or 0000 steel wool and oil will not harm the barrel crown. You can rub it with the oiled steel wool quite hard and see if the mark comes off.

After the cleaning you STILL need to lightly oil all the steel parts inside and out. The silicone wipe rag won't aid in preventing corrosion other than minimally. You still want proper oil on the surfaces.

For the barrel that means a patch with oil on it followed by a dry patch to remove the excess. Don't worry about wiping all the oil away. Oil is far more tenacious than that.

It's impossible to tell anything from that picture since the detail of the muzzle is far too small and the lighting too dark. Learn to use the Macro setting and get lots of light on the subject. If you feel like you need to reach for sunglasses it's just right. The closer you get to that point the better.
 
thank you all for your reply, I first tried to remove the blemish with 000 steel wool & oil but could not get the blemish away, and the steel wool appeared to start scratch away the finish at a 3rd-4th wipe. I finally had to cut a 2x2mm size 3000 grit sand paper and lightly buff out the blemish. did not hurt the finish.
 
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