Is my CZ 75 supposed to do this?

This seems to be a common phenomenon with CZ's. The pistol isn't specifically designed to do this, but most of them do.

I have the CZ 75B in 9x19

The slide closing upon an inserted magazine
happened a few times during the first 1000? rounds
but it doesn't happen much anymore - great gun,
uber reliable, and feeds almost anything.... I had one box of
Blazer alum. cased ammo it didn't care for much at all.
accurate and fits the hand or mine well.

R-

no it's not supposed to.

Most guns don't behave that way. It's arguably not supposed to do that. The purpose of the lever is to hold the slide open after the last round of an empty mag, and to make loading the first round of the next mag more easy. If it does that, it's done it's job.

What happens after the fresh mag is inserted is seldom addressed or discussed by gun makers, in manuals, or elsewhere. Most guns don't do it, but there are exceptions -- across the board, and across guns made by different gun makers.

Many of who shoot competitively with CZ or Glocks that demonstrate this "feature" love it, as it allows for quicker reloads when on the clock. Generally, if you don't SLAM the mag home, you won't see it happen as much (if at all). If you watch some folks at IDPA or USPSA matches, especially the shooters with the best times, you'll see that many of them have adjusted their weapons to do this every time.

Offhand, I can't think of any legal or safety issues this unintended slide closure could cause if you're following the appropriate gun safety procedures when reloading (i.e., keeping your finger out of the trigger guard, and the gun pointed in a safe/desired direction, until you're ready to fire, again.)

If this action really bothers you talk with CZ-USA about a fix. (It could be simple as a new slide stop, a new slide stop spring, stronger mag springs, or as involved [and as costly], if the gun is older, as a new slide.)

It's called auto-forwarding. Its common, and most guns will do it (though they're not specifically designed to). How readily they'll do it often will vary depending on how hard you slam the magazine in (some do it with a gentle insert, some you really have to smack it in hard, but most will do it).

Nothing really wrong with it, nor anything to worry about. I never put my fingers inside the chamber with the slide locked open regardless, and I've conditioned myself that regardless of what I'm shooting I"m aware that when I insert a fresh mag the slide may or may not drop. Be prepared to slingshot it if needed but don't be confused if the slide drops.

rbernie said:

This seems to be a common phenomenon with CZ's. The pistol isn't specifically designed to do this, but most of them do.

Click to expand...

Maybe with some Česká zbrojovka pistols, but not with my vz.50, vz.52, vz.70, nor vz.82. I don't have one of the 75-series, but it doesn't sound right to me.

My CZ P07 does this. I also like this "feature"

It's happened a couple times with my new P01 in competition when I got a little vigorous with reloading. If you just insert the mag normally without slamming it home it shouldn't chamber.

My older 75bd didn't really do it much.

My CZ 75BD does it. I don't mind. As others have mentioned, if you gently seat the mag it likely won't happen.

My Cz75 does it and I liked it so much I worked on the slide stop on my Glocks to make them work this way too. It works best with firmly seating the mag.

It's perfectly normal for many semi-autos, though it usually means you are slapping the mag in too hard.

Some designs seem more prone to this than others (CZs, S&W M&Ps, Walther P99/PPQs).

When I insert a full mag when the slide is locked open, the slide automatically slides closed and chambers a round.

Click to expand...

I wish they (at least mine) all did. It's not supposed to happen but, when they do (not all that unusual as some have noted), I consider it a plus.

Maybe with some Česká zbrojovka pistols, but not with my vz.50, vz.52, vz.70, nor vz.82. I don't have one of the 75-series, but it doesn't sound right to me.

Click to expand...

It may not be right, but that's not because the guns you mention don't do it...

The CZ factory complex that designed the 50, 52, and 70 from a different part of the company of the Czech (Communist) Armaments system. The CZ 82, which is also a very good (original) design was built by different designers than the two men who designed the CZ-75; the CZ-82 was intended for military/police use only.

The CZ-75, according to most versions of the CZ story, was primarily designed for export to the West. The West, however, had other ideas, and imposed an Embargo of nearly all Communist-made products; export was limited to Canada, West Germany, the Middle East and a bunch of African countries (where the Communist Bloc had great influence during the Cold War.

The Soviet Bloc/Communist/Czech military never used 9mm Luger (9x19) round and none of their military units used the CZ-75; it is thought that some Special Ops units may have had them in their inventory.

My point in writing this is to say that NOTHING about the CZ-75 was similar to any of the other CZ handguns cited: different factories, different designers, and much different design objectives.

As you say, the auto-forwarding of the slide is probably NOT an INTENTIONAL thing, but that is arguably true for a lot of guns, including the Glocks I once owned (a 17, 34 and 35), which all did it too.

All my semi auto guns (hk,m&p,glock,sr,ppq) do this. Some need a little more force when the mags are inserted to do it but they all do it. That's a flaw in the magazine fed semi auto design. There has only been a handful of guns I've handled that didn't do this. I have heard people say when you jerk the pistol forward while inserting mags causes this as well. You might be doing this as well unintentionally.

No it's not supposed to do it, but "broken"....well, maybe not, but something is out of spec if the firearm doesnt function as designed. Consider the cause of this phenomenon and what other unintentional actions maight happen. if you're good with it, run it as is. Otherwise, yes, it's not working right.

ETA I have never had a gun "accidentally go into battery" in this fashion, 1911s from Springfield, Para, IAI, Charles Daly, XDs, keltecs, Glocks, a Baby Eagle, Taurus 92, Colt Challenger, Ruger 22/45, or an LDA Para.

I've always thought of it as a plus; if it happens, it happens. My Gen 2 Glock 21 does it reliably if I seat the mag with anything resembling firm force. My G19 4th gen does not. My CZ75-B will do it if I ram the magazine home but not reliably.

-T

My CZ75 "pre B" will auto close over half the time. Not enough to depend on as a match technique.

My S&W Plastic M&P will auto close nearly every time. Very handy for a slide lock reload in IDPA. I had one failure when the slide closed before the magazine follower could get a round into position and it shut on an empty chamber. Click. I have seen it happen to other guns and shooters, though.

I know Glock shooters who have intentionally rounded off the corner of the slide stop to ensure the trick.

jjones45 said:

That's a flaw in the magazine fed semi auto design.

Click to expand...

As Microsoft used to tell us, that behavior is not a flaw (bug), but a FEATURE!! <grin>

The Model 50 and 52 were not made in the Uhersky Brod factory. The CZ-70 was the first one to be made there (though most were just reconditioned CZ-50's).

Oddly enough, I've never had a CZ-75 that so closed, but it wouldn't bother me if it did.

Just about any centerfire autoloader will do it if you seat a magazine hard enough.

Ash said:

The Model 50 and 52 were not made in the Uhersky Brod factory. The CZ-70 was the first one to be made there (though most were just reconditioned CZ-50's).

Oddly enough, I've never had a CZ-75 that so closed, but it wouldn't bother me if it did.

Click to expand...

Actually, the vz.52 and the vz.50 (initially) were made at Strakonice. Production of the vz.50 was suspended for a short time in the late 1950s and was then resumed but at Uhersky Brod. The vz.50 was "replaced" by the vz.70 in 1970. Very early vz.70s made use of some parts which were to have been used for vz.50s, but I don't believe that many - if any - were "reconditioned CZ-[sic]50's". All vz.82s and CZ83s, of course, were made at Uhersky Brod, as well.

S pozdravem, můj příteli.

Walt Sherrill said:

It may not be right, but that's not because the guns you mention don't do it...

The CZ factory complex that designed the 50, 52, and 70 from a different part of the company of the Czech (Communist) Armaments system. The CZ 82, which is also a very good (original) design was built by different designers than the two men who designed the CZ-75; the CZ-82 was intended for military/police use only.

The CZ-75, according to most versions of the CZ story, was primarily designed for export to the West. The West, however, had other ideas, and imposed an Embargo of nearly all Communist-made products; export was limited to Canada, West Germany, the Middle East and a bunch of African countries (where the Communist Bloc had great influence during the Cold War.

The Soviet Bloc/Communist/Czech military never used 9mm Luger (9x19) round and none of their military units used the CZ-75; it is thought that some Special Ops units may have had them in their inventory.

My point in writing this is to say that NOTHING about the CZ-75 was similar to any of the other CZ handguns cited: different factories, different designers, and much different design objectives.

As you say, the auto-forwarding of the slide is probably NOT an INTENTIONAL thing, but that is arguably true for a lot of guns, including the Glocks I once owned (a 17, 34 and 35), which all did it too.

Click to expand...

Walt -

The point of my post was to voice disagreement with "rbernie"'s assertion that this is a problem common to all ČZ pistols. Again, as I said, it has never happened with any the ones which I own.

I like to think that I do have at least some passing knowledge of the history of Česká zbrojovka, but thank you for trying to bring some enlightenment to the darker regions. And I applaud the fact that your Glock ownership was past-tense.

Very interesting.

My Tanfoglio has never done this in 20+ years of owning it. My buddy's CZ75 has never done this.

I was handed a Baby Eagle once with it locked back. I inserted the mag and into battery it went. I was shocked but the guy that owned it said it was designed that way. I believed him. Did it every mag change regardless of how forceful it was inserted.