Corrosion issues Yugo Mauser

[gretsch6120]

Hey all,

I keep getting a layer of either rust or oxidation in my yugo barrel. I shoot corrosive ammo. After I shoot I patch the bore with windex or something with ammonia in it. Then patch it with solvent until I get clean patches then I layer it with a couple patches of Hoppes oil. I never had rust or corrosion issues until the last couple of weeks. Ive been keeping the humidity down with a de-humidifier and moisture soaking packs in the safe. But every day im having to brush and clean the bore, then do the whole process over again its seems like its rusting or corroding still. The patches come out a dark red or brown. I was wondering if anyone as any insight to whats going on and how I can stop this stuff from going on. Any help would be welll appreciated!!! Thanks!

[knucklehead0202]

clean it with some hot soapy water, then kroil. clean it with the kroil and then just patch the bore with it and leave it, check up on it here and there.

[TRAP55]

Bronze bore brush and Hoppes, Then patch it.

[JohnnyPark805]

ammonia does nothing. use hot water, clean and then oil as normal.

hoppes #9 is not a lubricant nor will it prevent rust

[kurac]

Windex is convenient, I usually just spray some down the breach and let it drip out the muzzle while the barrel is still hot. I think diluted simple green will work just as well. The key is to do it while the barrel is hot or to have the water hot.

[fal_762x51]

Hot water with soap.

[Armistice]

Windex is convenient, I usually just spray some down the breach and let it drip out the muzzle while the barrel is still hot. I think diluted simple green will work just as well. The key is to do it while the barrel is hot or to have the water hot.

I use whatever is in the bottle I buy

[BruinGuy]

You want to be careful using ammonia or ammonia-based cleaners in your bore; if not cleansed thoroughly ammonia will cause corrosion!

Windex has very little ammonia, and it's really the water that cleans out the corrosive salts. If boiling water makes you nervous, a good thorough spraying with just water is fine. It's also cheaper than window cleaner.

If you're getting rust in your bore, it may be something that was already there and you're just getting to it because it was loosened by firing or cleaning. It sounds like your cleaning regimen is fine, except I might try the following to see if it comes back between cleanings.

1. Pour a liter or so of boiling water down your bore.
2. Spray WD-40 down the bore and over any metal that was exposed to water, and then blow it out with compressed air.
3. Using your favorite solvent, such as Hoppe's, clean the bore thoroughly with brass brush. 5-7 runs through the barrel is usually good. I like to put a patch on the brush every third run through to collect the gunk I'm brushing out.
4. Continuing with solvent, use patches on a jag. Continue until they come out mostly clean. With older rifles, they may never come out completely clean. You may get a little bit of black or green-tinge to the patch. I think the green tinge may be a reaction of the solvent with some minor copper fouling in the grooves.
5. Clean off the metal surfaces, and lightly coat with gun oil. Run a patch with gun oil down the bore. (Before shooting the next time, run a clean patch through the bore to clean out the oil.)

Check it after 2-3 days to see if the red/brown gunk has come back. I've not heard of corrosive primers being that tenacious to stand up to multiple cleanings such as you describe, but it's definitely something you want to keep an eye on. In my rifles, when I follow the above, I never see rust in the bore, even in rifles that had been previously neglected or pitted. However, if the bore was rusted at some point in its life, you have to keep a closer eye on it, because you can't really get rid of it completely.

Good luck!