Cz858 ftf

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Longshot84

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Hey guys,

I was curious if anyone had some insight on what may have caused multiple FTF in my CZ this weekend? I switched from Czech surplus to Russian Surplus, so there was a minor change in the casing finish (copper washed russian), but I doubt that would have an impact. I noticed that the carrier movement was a little rough, and not freely sliding in the receiver. Could it be something as simple as not enough oil on the rails of the receiver?
 
I have changed from green cased to copper cased intermittently and never noticed a change. Either in accuracy or handling. Could be something unrelated, or mag/feed issue.
Make sure you tap your mags so all the rounds are seated correctly in the mag, could be bent feed lips as well.
 
Four of the mags have only been used twice before, and two of them look to be a little bit "used". Haven't had a failure to feed issue before, so i assumed the mags were fine. All rounds are fully seated in the mag.

The cartridge would be partially fed into the chamber, but bind before the round is fully chambered. It looked like the bullet was hitting the top of the chamber, and the breech block was pinching the side of the casing. If I pulled the carrier back about 1/4" once the round was jammed and released, it would complete feeding the round into the chamber. There would be a FTF at least once for each magazine with 3 FTF/magazine happening only a couple times. I went through 160 rounds, so it got really irritating by the end.
 
I have noticed that the working parts on my 858 require more oil in order to move as smooth as my other semis. I won't presume to insult you by saying you don't oil your firearms, however, maybe a bit more might help? As for it being a mag issue, it's possible. I have one CZ mag that doesn't lock the bolt back on the last shot nine times out of ten, so they certainly are susceptible to wear.

Have you disassembled the rifle and looked for any defects/oddities in the working parts?
 
Yeah, I had it apart at the range after the first half dozen FTF, and then had a piece by piece examination when I stripped/cleaned it. No apparent defects from what I can tell.

I've always applied a thin coat of oil to the rails in the receiver, trigger assembly and springs, but it has sat in the safe for about 3-4 weeks, so it may have just evaporated or something??? I put a pretty thick coat on after I finished cleaning as this was my initial assumption, but probably won't have enough time to take her out for the next few weeks.
 
Try grease next time on the rails and lube everything else. Doubt that is the cause tho, are you riding the charging handle when cocking the rifle???
Not trying to be an ass just asking.
 
Haha I love how everyone is careful not to hurt feelings today :D I let the charging handle fly at all times...it looks and sounds cooler :cool:

What type of grease should be used? Just a Cambodian Tire bearing grease or something like that?
 
Yeah that kinda grease should be fine, I just spend the 10$ on miltech lube as the stuff is fantastic.

I know you mentioned mags, but try another one or someone elses and see what happens.
 
Try dropping the bolt with no mag and the safety off to see if its the bolt catching the sear. I use a light coat of oil on everything and have never had this happen even in the winter.
 
Sorry supernova you'll have to clarify what you mean by dropping the bolt...as in release the carrier? (Still a bit of a newb and haven't picked up on all the terminology yet)...how will I be able to tell if the bolt is catching the sear?
 
Is this a new rifle? Mine had stovepipes for the first few mags, but it now runs like a champ. Try to cycle a couple of rounds through manually, ie.(full mag, charge them out one by one.
 
Yup, brand new when i bought it, and have used it 3 times or so. Good idea on cycling manually, I didn't think of that. I'll give it a whirl later tonight and post what the result is.

Cheers all, thanks for the help!!!
 
If its new... as mentioned... cycle it by hand. The paint coating can be thick in areas and can cause drag. As it wears you should notice it become smoother. Also as mentioned more oil/grease the better, not that you need to dunk it but I would put on more than you usually do.

just my 2 cents
 
Longshot84 said:
Sorry supernova you'll have to clarify what you mean by dropping the bolt...as in release the carrier? (Still a bit of a newb and haven't picked up on all the terminology yet)...how will I be able to tell if the bolt is catching the sear?
Click to expand...

Letting the bolt fly from the rear position as it would when chambering a round. With the safey off, the disconnector lug on the bottom of the bolt will catch the sear and stop the bolt if you try to ease the bolt closed by hand. That is normal and when dropping the bolt it should not hang up.
 
mine are smooth when they wet with lubriplate 105.

good enough to build engine with, good enough for VZ's

L0034-094.jpg
 
Alright, I cycled 40 rounds manually - 20 rds Czech, 20 rds Russian. Every single Czech cartridge fed smoothly, not a single jam. The Ruskies didn't fair so well. I had 7 FTFs....I don't get it:confused:
 
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