What are the consequences of rust in a CZ-858

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When I first bought my (non-chromed) CZ-858, I cleaned the barrel like mad immediately after firing. I also cleaned the parts of the gas piston assembly that I could access, such as the piston itself. This appeared to work for a while.

Now, however, the barrel is always rusty, even after I clean all the rust out. I figure that I must have neglected the hard-to-reach parts of the piston where the gas flows from the barrel to the gas piston tube, or maybe the chamber itself (too much focus on the barrel.) I can't actually tell where it's coming from - everything else in the rifle, and the exterior, is clean and free of rust.

Assuming the rust comes from the firing chamber, or the gas tube, what are the consequences of rust? Does it pose a safety hazard, such as erosion venting gas, or would operating malfunctions happen long before that?
 
If you're using solvents and scrubbing as if it were pennance, you're also stripping the protective layer of oil (that should be) on your rifle. If you don't re-oil the rifle after cleaning, it'll start rusting, despite the fact you just cleaned it.
 
What are you using to clean it? In my experience corrosive ammo must be cleaned with boiling water. I always pour boiling water down the barrel, over all the parts, and everything else that can handle it. Scrub them with a brush, repeat. Simply scrubbing with brushes, patches and oil won't do anything. The rust will be just as bad as if you didn't clean it at all.
 
I G96 the bore and gas system if i don't intend to use it right away and then remove it before heading to the range.
 
H Wally said:
What are you using to clean it? In my experience corrosive ammo must be cleaned with boiling water. I always pour boiling water down the barrel, over all the parts, and everything else that can handle it. Scrub them with a brush, repeat. Simply scrubbing with brushes, patches and oil won't do anything. The rust will be just as bad as if you didn't clean it at all.
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Exactly Hugh!
Me and H Wally normally went shooting together when he was in Victoria for school last year. We would clean our guns at my place before he would go back to his place, since he couldnt store them there.

We both just poured boiling water over all the parts, then cleaned the bores out.
You dont even really need to use that much oil to clean these guns...you just need to use boiling water.
I like to take the bolt apart and throw all the small parts into the sink, plug the hole and fill it with boiling water. That way the water seeps into all the little spots in the smaller parts. For the gas port and the barrel, I just pour water in over the tub. It takes 5 minutes to boil the kettle, and 45 seconds to pour the water. Then you spend about 5 minutes cleaning out the barrel...you could add a tiny bit of oil but I dont. Completely cheap way to clean your gun, and I have had ZERO problems so far. :dancingbanana:
 
i dunno but mine was rusted really bad so i bushed it out and took it out for a mexican tune up. my accuacy was out a bit but then again i wasnt trying, i just wanted to tune it up a bit.
 
Does anyone use Sweet's 7.62 solvent? I use it on my SKS and it works really well for corrosive ammo, I don't even soak it in hot water I just scrub really well and soak it for a bit with these solution and then coats of oil on everything till I shoot it again. Never seen a spot of rust or corrosion yet.
 
Ah, that's it then. I only used hot water a few times, mostly using windex followed by Hoppes followed by dry patches followed by oil. I always reapplied oil to the entire rifle at the end, which is probably why most of it didn't rust. I will have to use hot water more, as that always worked in the Mosin-Nagant after firing Czech corrosive ammo.

For those purchasing a CZ-858, I recommend a chromed version.

Given the possible damage to the chamber or gas valve, what are the safety implications? If barrel rust hurts accuracy, that's one thing, but damage to other parts of the rifle could impede safety.
 
There is a 858 tactical-2 in a shop in my city that I really want to buy but that is non-chromed barrel. I like the chromed 58's on marstar but I enjoy the compact of the tac-2, would it be legal to put a folding stock on the 58's that marstar sells?
 
Are you sure its rust and not copper in your barrel?

I cleaned mine last with hot water, and CLP. When I look in the muzzle I can see some orange-ish coloring on the lands, but not the grooves, and the bore is nice and shiny when I shine a light down it. That being the case, I'm pretty sure its copper I'm seeing on the lands, not rust. Guess I gotta run soem Sweets through there.

As an interesting aside, I shot my SKS at the same time (2 weeks ago) and DIDN'T clean it, and there is not a single spot of rust in the SKS (even the gas tube). Ammo is Czech surplus corrosive.
 
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