Help with CZ 75

[floydster]

I have 75B and a PCR, never experienced this condition.

 

[Roadking Rider]

I have a CZ 75B ,PO-1 and ,82 and have never had a problem of any sorts. These truly are great pistols.
To be honest I've never had a problem like your talking about with any pistol I've owned Polymer or not.

 

[History.Doc]

I have a cz rami, 83, 75b, and 75 compact and I have never had that issue with any of these firearms.

 

[brutus51]

I have an 85 combat that does it all the time, unless I gently insert the mag.
on the other hand it never happens in my PCR no matter how hard I slam the mag in. Go figure.

 

[carlrodd]

My department-issued MP 9 does it near 100% of the time, as do most of the other issued MP 9s. Our range-master sees it as a positive, and as such, we actually train to vigorously insert during mag changes to increase the chance of it happening. After much training with this weapon, I see it as a huge plus.

 

[Weevil]

Auto forwarding is not normal with "most" brands of pistol.

Oh sure if you slam the mag in hard enough just about any gun will do it, but under normal conditions this should not happen.


What usually causes this is wear in the slide notch and on the lever where it catches to hold the slide is using the slide-stop to release the slide. The corners and edges that hold the lever in the slide notch become rounded as they wear and won't hold as well as crisp sharp edges.


Now I'm not gonna get into what's the proper method to release the slide, just saying that this wear and rounding contribute to the "auto-forward" issue the OP brought up.

And yeah some pistols can be released with the slide-stop and never ever "auto-forward" and some can't. Quality of steel, depth of the notch, angles, etc...are all factors as well. Which is also why some guns are more prone to doing it.

 

[1SOW]

Auto forwarding is not normal with "most" brands of pistol.

Oh sure if you slam the mag in hard enough just about any gun will do it, but under normal conditions this should not happen.

Sir you contradict yourself.

I have 3 CZ 75s I shoot, and all three will release the slide with a "firm" fast mag change. The 9mm 75 Shadow is two months old with not much more than 1K rds through it. Did it from day one.

My Sig 239 will do it, but it takes an excessively firm insert to release the slide.

The top bullet in the mag is bumping the slide up and releasing it from the the slide stop.
It's NOT a problem.

If you want to insert a magazine and have NO bullet in the chamber, release the slide and then insert the mag.
Why would you want a pistol in the condition of slide locked open with a loaded mag inserted?

 

[juk]

The PCRs my dad and I own do not have an issue with auto forwarding. My CZ 97, on the other hand, will do it on occasion. It only does it when I have a full 10 rounds in the mag and slam the mag home pretty hard. I give it a bit of leeway, though. My 97 has had the snot shot out of it and is such a sweet shooter.

 

[KnekBeard]

My pre-b has not done it that i can remember, but my p02/1 has done it without slamming a mag in excessively since it was brand new. My gf's pcr does it less often. Always have good muzzle discipline with any firearm. All guns are always loaded, right? I do not feel it is a problem or unsafe.

 

[Jessie James 58]

So far my CZ 85, CZ 75, 9MM RAMI, 9MM 239 Sig will not auto close when slamming in a mag. I am not sure why one would unless there is a problem with the mag.

 

[Destructo6]

My department-issued MP 9 does it near 100%

But not 100%, so it is not reliable.

we actually train to vigorously insert during mag changes to increase the chance of it happening

Good god, what kind of department is this? You are counting on inducing a malfuction (slam charging is a malfunction) and wasting time in doing so.

 

[Walt Sherrill]

Good god, what kind of department is this? You are counting on inducing a malfuction (slam charging is a malfunction) and wasting time in doing so.

Malfunction: vi. to fail to function as it should.

If the function of the slide stop is to hold the slide open so that the next magazine can be properly inserted and the next round loaded, a "slam charge" may NOT be a malfunction -- just an unanticipated benefit! My Glock 34 did it from the day I bought it, and I found it a useful feature.

On the other hand, several shooters I've talked with and watched compete (people who shoot for a living, i.e., nstructors, USPSA shooters who are paid to shoot by sponsors) apparently modify their weapons so that the slide closes when the mag is inserted. They took what you consider a "mal" function and made it a "proper" function.

What are the consequences of a slam charge?

1. If the slide is already closed, when you are about to press off the next round, you've gained time when time is critical.
   
2. If the slide hasn't closed, and you're aware of it, you're exactly where you would have been -- slide locked back waiting to be released.
   
3. If the slide doesn't close and you're expecting it to, the failure to do so adds a little extra time to the process -- but it's generally pretty obvious. If you train for that eventuality, it should not be a big deal. And, we don't know that the department in question did NOT train for that eventuality.

When I've shot or competed with a gun that generally closes upon mag insertion, I can always tell when it doesn't do so as expected -- by the sound and feel of the gun. You might argue that this extra, unanticipated delay could be critical in a life/death situation, and I agree -- but so could the extra second (or fraction thereof) gained when it works properly.

More importantly, I've not personally seen or heard of a problem resulting from this type of activity that couldn't also happen when the slide is manually released (by slingshotting, overhand, or slide stop/release manipulation.)

 

[JHansenAK47]

"slam charging" will occur on just about any autoloader, if you hit it hard enough.

It is not reliable and should not be relied upon.

Some designs are reliable about 'slam charging', i've been able to do it consistently on beretta 92s but that aside it isn't reliable cross platform and even within some platforms with all the pistols.

numerous people waste time, whacking the bottom of the seated magazine, trying to get the weapon to slam charge instead of using a 100%reliable means of sending the slide forward (slingshot/slide release).

+1 They say in an emergency or even great stress(IDPA) you fall back to the level of your training. Why learn bad habits when that muscle memory can come back and bite you.

 

[19&41]

If you have access to a range that rents pistols, try what they have to offer and see if they show that characteristic. With any luck they may have a 75 type pistol.

 

[Weevil]

Sir you contradict yourself.

No actually I'm not, since I don't consider slamming the mag in so hard that it causes the slide-stop to dislodge "normal".

Why would you want a pistol in the condition of slide locked open with a loaded mag inserted?

Because that's how it was designed to be used.

If it was designed to close automatically there would be some mechanism to release the slide, so it would perform this function 100% reliably everytime a mag was inserted.

The top bullet in the mag is bumping the slide up and releasing it from the the slide stop.
It's NOT a problem.

HUH???

What in the world are you talking about???

"The top bullet is bumping the slide up"???

The top bullet never even contacts the slide until the slide closes.

 

[Destructo6]

On the other hand, several shooters I've talked with and watched compete (people who shoot for a living, i.e., nstructors, USPSA shooters who are paid to shoot by sponsors) apparently modify their weapons so that the slide closes when the mag is inserted. They took what you consider a "mal" function and made it a "proper" function.

No competitive shooters that I shoot with have done this.

It's bad training (which is my profession) and should not be relied upon. Certainly not when one's life might be on the line.

Yes, it is a malfuction. It was not designed to release the slide upon insertion of a loaded magazine, so when it does, it is not operating as designed = malfuction.

 

[Trent]

If you use the slide stop lever enough on certain guns, it will round off the notch in the slide. The gun will "auto forward" as you say it, more and more easily, and eventually will STOP locking back on the last round altogether!

Whenever I put a magazine in, I always rack the slide back and release, rather than using the slide stop lever.

If in doubt on whether it's safe to repeatedly release the slide with the lever, or if you are NOT supposed to do that, check the owners manual or call the manufacturer. Replacement slides are expensive if you round off the notch...

(EDIT; Weevil beat me to this diagnosis back on post 31)

 

[WaywardSon]

My CZ-75B Compact has never done this...but then again, neither have any of the several other semi-auto's I own exhibited this behavior. Maybe I need to learn to slam it in harder.