Brand new CZ-75B jamming issues

[Jesse1904]

Hi I recently purchased a CZ 75-B in 04/15 brand new.  9mm.

I've gone  to the range 4 times, and out of the 4 times, there has been at least one jam per visit.  FTE / Stove piping.  Has happened to 4 different people on both magazines.

The first time, brand new out of the box (first range visit), I used fmj Federal Aluminum ammo from Walmart.

Figured it was the aluminum that was causing the jam.

The second time after a clean and breakdown of the gun, I used fmj Winchester white box 9mm ammo from Walmart and it was jamming again.

Out of 800+ rounds so far, it has jammed a total of 8 times.

I've done 4 breakdowns/cleaning of the gun extremely thoroughly.

Here's a video of the jam in action; You can see at the end of the video, the casing is still stuck in the barrel/slide while the new bullet is getting pushed up through the magazine.

https://youtu.be/m66nBB6oOmA


https://youtu.be/RvAu7qMyHhY

I have not contacted CZ yet, but was hoping maybe it's just a beak in period to loosen the spring or slide.

Thanks

[jdgray]

Are you getting stovepipes? Hard to tell in your videos. The only stoppage I have ever had with a CZ, was caused by the bullet nose engaging the slide stop. Easily remedied by trimming the nub on the stop.

[Jesse1904]

the cartridge doesn't fully exit the barrel causing the jam.

[ocny17]

Stovepipe... slide isn't cycling all the way back (or cycling too fast), not giving the spent cartridge shell enough time to eject.  Could be the ammo (not enough pressure) or the recoil spring (too heavy).  Thoughts?

[cntrydawwwg]

First off, Welcome to the forum Jessie.
    How wet are you running it? Make sure you have plenty of lube on the slide rails. I've never had issues with WWB myself.  It could be the ammo, but most of the time on these questions it seems that not enough lube was used. Not sayin this is your issue, just that it's a good place to start.

[jdgray]

CZs have a fairly light recoil spring, usually tossing brass 20+ feet, so weak ammo usually wont stop them. They did have weak extractor spring issues, as wolff sells extra power springs to fix that. 4 jams in 500rds is not really terrible, but not good in a defensive gun. Use the 2yr warranty before it expires, or call them.

[Jesse1904]

First off, Welcome to the forum Jessie.
    How wet are you running it? Make sure you have plenty of lube on the slide rails. I've never had issues with WWB myself.  It could be the ammo, but most of the time on these questions it seems that not enough lube was used. Not sayin this is your issue, just that it's a good place to start.

Hi, thanks for the welcome.  I love my CZ and they are so aesthetically pleasing.

When I oiled up the rails the first break down after the jam, I sprayed it very thoroughly with the spray nozzle (also using Q-tips to get in the areas I can't reach.) thinking it would solve the issue,

The second breakdown I did a standard oil job, not lean or too drenched. But a more thorough clean.

I'm going to test the gun out again tomorrow and hopefully I have no issues.



And I just looked up what stovepiping is, and it does fit the description.  FTE in most cases is what's happening.

[ThompsonCustom]

When I oiled up the rails the first break down after the jam, I sprayed it very thoroughly with the spray nozzle (also using Q-tips to get in the areas I can't reach.) thinking it would solve the issue,

Just use some grease in those rails, if there is to much grease it will come off in the first couple times the slide cycles.

If it jams again get as much detail as possible, is the mag hard to pull out? what is the position of the first round in the mag? is the round hard to extract? anything you can record can be helpful.

[Joe L]

If the slide is not coming back far enough to hit the ejector or catch the next round, it is usually due to the gun being tight and new.  Sounds like you have done the oil and lube right.  Also make sure you get a touch of oil on the hammer where the slide contacts it, and make sure the hammer action is smooth, check it by hand.  If the hammer isn't binding, the slide is lubed, and the frame isn't interfering, check the recoil rod and spring and make sure it isn't binding.  Clean the chamber also.

I would sure try some different ammo also.  A tight new gun and a lightly loaded ammo will result in FTE's and stovepipes like you have described.  I couldn't shoot my normal soft shooting match ammo in any new gun.  I had to break them in with something a little stouter, then switch over and the guns would then run fine. 

Don't give up on it yet.  If it is just a little tight, when it loosens up just a little, it will be a great shooter from then on. 

Joe

[Independent George]

After 500 rounds, it should be broken in by now. I would actually lean towards the recoil spring being too strong than too weak.

My SP-01 came with what felt like a 22 pound recoil spring; I only found out later that it's supposed to be 16. It didn't jam on me, but it always bothered me that it was so out of spec; I wondered if they used the spring meant for a .40 pistol.

Anyway, if it"s too heavy, the timing gets thrown off and it won't capture the next round properly. CZ Custom and Cajun Gun Works sell recoil springs for I think $8.

[RickR]

Were the jams like the ones I had? If so a 12 pound recoil spring fixed everything.

http://www.czfirearms.us/index.php?topic=70974.0

[Joe L]

After 500 rounds, it should be broken in by now. I would actually lean towards the recoil spring being too strong than too weak.

Oops, missed the 500 rounds.  I agree, try a lighter spring.
Joe

[Stuart]

not extracting?
usually extractor or recoil spring.
check extractor, make sure its intact.
check behind extractor to make sure no build up of carbon, etc.
check extractor spring. good tension.

check recoil spring, make sure not too heavy for the ammo you are using. try speer lawman or few round of a good defensive ammo ( usually a little more velocity in those)

Make sure you are well lubed.

[jwc007]

I've seen this before and believe that you are having Extractor issues.  Send it in to Cz-USA and get them to fix it for you, so long as it's under warranty.

[ocny17]

Question to those with more experience with these things:

Taking the shooter out of the equation, if it's a problem with one or more of the parts (i.e. extractor spring, extractor, recoil spring, etc.), and I'm assuming these components maintain the same performance in between each consecutive shot (i.e. during the same shooting range session), wouldn't the only variable be each individual cartridge?

If so, then wouldn't this (ammo) partly explain why less than 1% of the cartridges caused a failure?  For example, maybe the recoil spring is on the heavy side, and 1 cartridge just happens to not have enough pressure, causing the slide to not move all the way back thereby not giving enough time for the spent casing to get ejected.  Does this make sense?

I guess what I'm trying to understand, since I can only base this on others' collective posts and my very limited personal experience with these failures, is how one can determine that the problem is a specific component if that component itself performs well at least 99% of the time and then somewhere in the middle of 500+ rounds it does not perform adequately enough.

Sorry if this has been asked before and if this is starting to get off-topic.  I'm just trying to gain a better understanding of how to isolate a faulty component amidst all these interrelated mechanisms working together.