It looks like a "clean me every 1000 rounds" issue than any other reason.
They clean horses don't they? why not clean your rifle, too?
PP.
No the rifle is fine. I was actually trying to make the point that, in my view, it is a very reliable rifle when using the FMJ Czech surplus. I know that my girlfriend has had 2-3 of those "break part of the rim off the casing" malfunctions, and I think I have 1 or 2 (I cleared all the malfunctions) but that is in about four crates (1120 rounds x 4) plus a couple of those shrink wrapped "battle packs" from Lever (300 rounds x 2), plus various other soft point rounds and whatnot. One malfunction or so per 1000 rounds seems pretty good to me.
It is a good rifle. Cleaning... I've always cleaned mine very meticulously after each trip to the range. I have yet to see any visible evidence of the effect of corrosive ammo, but that is what I am trying to avoid. My AR, my Swiss, my 9mm AR, sometimes go a month or more without being cleaned, but the ones that shoot military surplus (858 and K98k's) get cleaned to the bone every time. Usually the 858-4v shoots about 80-120 rounds per weekend, and is always thoroughly cleaned.
The malfunction I have described... it will rip an extractor sized chunk right out the rip of the casing trying to pull it out. While I don't rule it out, that would have to be one seriously gummed up chamber to hold it in there like that when the extractor is pulling that hard on it.
My own theory is that it has something to do with the ammo/casings that came in one of more of those "battle packs" - the ones where each package is a folded piece of paper with one 10-round stripper clip, sealed in a clear plastic bag, and then the whole pack of 300 is sealed in shrink wrap. That ammo is different from the "crate" ammo. The casings are a lighter colour of gray, and they have more umphff to them, and more muzzle flash.
I have had something similar with surplus 8mm ammo in K98k's - where the casings crack at the mouth and get stuck in there pretty good. The difference with the k98k action though is, if you want that casing out of there, it will come out if you use enough force. With a semi-auto action, I am more inclined to just tap it out from the front if I know the bullet is gone.
Anyways, cleaning is good. I take your points. I am a big gun cleaner myself.
Here are some pics and vids of my gun. It is all the same gun. It used to be a folder, now it is a woody.
http://www.youtube.com/watch?v=yTF5Q8p1nVQ&feature=related
http://www.youtube.com/watch?v=8Osx7S2Kcvw&feature=related
http://www.youtube.com/watch?v=v15pFTOoZAM&feature=related
http://www.youtube.com/watch?v=wxCZTCgpxyQ
http://www.youtube.com/watch?v=NFRqiQGJoj0&feature=related
http://www.youtube.com/watch?v=iVM_CL85oqY&feature=related