Is this normal for an sks?

In the future, every time you shoot corrosive stuff, the bare minimum is hot water down the bore, through the gas tube and rinse the piston and the bolt (in pieces). I rinse everything but the stock as it's very easy to field-strip the rifle. The hotter the water the quicker it dries (got a 1.7l electric kettle for under $10 at wally's world). While the small parts are trying I clean out the bore and she's good to go. Corrosive cleanup adds about 10-15min to the entire job, but the only drag is that you have to do it as soon as possible after shooting (I do it as soon as I get home). Some may tell you what I do is overkill but if I didn't disassemble and clean the bolt, I would have never found out that it was developing a nasty crack that would have cost me a couple of fingers. Got a replacement on order from Marstar as we speak :)

Tip: I always leave the bore, the gas tube and the piston heavily oiled and just wipe off the oil on range day or the day before. That protects the components that are most exposed to corrosive salts in case some didn't wanna rinse off (fat chance but still lol).

Pretty much the word on corrosive ammo and primers.
Hot water works best. Then dry and clean with your favorite mouse milk gun goop.

And 0000 steel wool with a little wd 40 will take that off.
 
Yep...steel wool and WD. That bloody corrosive works some fast...........but at the price you just have to shoot it :)
 
Thats rust. Strip your gun right down every time get the stock off and pour the boiling water down the barrel on the gas port on the rails. I use warm soapy water on the bolt carrier/bolt and the gas piston. The boiling water will dry in seconds and is harmless compared to the ammo you are shooting. I have a small air compressor at my gun table to speed up drying an get the nooks. There isnt a spec of rust on my sks
 
Keep it really gooey and it'll wipe off, more or less on command.

Hot and soapy water treatement with more goo after how ever long it takes you to care (for me it's about 500-100 but I don't care about my sks) and repeat.

Don't be too concerned. It's a $170 gun after all. I mean that as a good thing. They're disposable. :)

Not that you broke this one, just a point. I use 75 w 90 gear oil in my piston, and it stays put.
 
Had a couple rust spots like that on mine once. Let it sit a couple hours after shooting til I got home to see if I could get away with not taking the time on range. They were around some electro-pencilling and wiped off with a rag but gotta clean it sooner
 
Try using a steam cleaner instead of boiling water. By using high pressure steam to clean your rifles it gets everywhere drys super fast and you don't need to scrub as much. Then use an aerosol spray lube to get in all those crevices wipe clean then your done
 
To have lots of copper deposits on the gas piston after a round of shooting?

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Yup my piston looked exactly like that just a couple hours after shooting corrosive in my new SKS. I just took one of my cleaning brushes and scrubbed off all the carbon and rust dots with some Froglube. Good as new. I give both my Cz858 and SKS's a good clean as soon as I can every time I shoot corrosive, and I just use Froglube usually. Hot water works too.
 
Copper would never make it to that side of the piston... Definitely rust.. No harm no foul, a million ways to get it off just take yor pick and be more diligent with cleaning next time
 
Copper would never make it to that side of the piston... Definitely rust.. No harm no foul, a million ways to get it off just take yor pick and be more diligent with cleaning next time

That's what I was thinking due to the walls being to tight.

It's rust no doubt about it. With rust allot of people forget to clean the gas tube between the barrel and the piston because it's hard to clean. That's were you will find rust and can tell if someone cleaned it well or not. The piston who cares that sucker doesn't matter to much. (were the rust is) I shoot factory ammo because 1 it's less work and 2 it shoots better for not allot more money.
 
I just use Windex D at the range when I'm done shooting. Spray down all the parts and dry it off. When I get home I use Hoppes and G96. Never had any rust despite tons of corrosive filthy Chicom ammo through my SKS.
 
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