Author Topic: Cz 52 loose breech  (Read 757 times)

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Offline Dr_Sick_MMA

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Cz 52 loose breech
« on: January 31, 2016, 05:45:34 PM »


After watching this vid I went and checked all my cz's. At least half of them have at least a little play in the breech lock. Anyone else experience this?  The 52 had about as much as the one demonstrated in the video above.

Offline jerryberry

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Re: Cz 52 loose breech
« Reply #1 on: February 03, 2016, 05:56:26 PM »
No, mine is tight, no play. I do wonder how this effects safety, in regards to the barrel cracking at the breech. Thanks for finding this, I had never heard of it before.

Offline teckno

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Re: Cz 52 loose breech
« Reply #2 on: March 11, 2017, 09:53:24 AM »
I would like to discuss this topic further as there is not a lot of info concerning this issue.

I do not believe that any of the CZ52's have zero breach movement or play between the breach face and the barrel when locked.

In my opinion the best way to verify the play in the breach is to remove the recoil spring from the barrel and install the barrel Assembly into the slide.

Now while holding the roller cam back towards the chamber with your finger to "lock" the barrel to the slide you can try to move the barrel assy fore and aft to see how much movement there is and what parts are allowing the play.

I have measured my CZ52 with both the original barrel assy and a new unfired barrel assy.
Original barrel assy had .48mm play.
New barrel assy had .37mm play.

Rollers on both old and new were within within one thousand of an inch of each other.

What I found was most of the play was caused by looseness between the cut in the barrel that the roller sits in when fully locked and the groove in the center of the roller.
Installing new rollers would not help this situation unless they were custom ground where the center of the roller would be larger compensating for the barrel wear.

When you think about it, only the small area at the center of the roller is contacting the barrel channel is keeping the breach locked.

Let me know what you think.




 
   





Offline rdcinhou

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Re: Cz 52 loose breech
« Reply #3 on: March 11, 2017, 01:09:20 PM »
I just checked my CZ52.  There is absolutely no play in the breech.

I don't know the prior history of my CZ52, but it looks like one roller is older than the other as they have slightly different internal IDs and show different (i.e. not uniform) wear.
CZ 24, CZ 27, CZ 38, CZ 45, CZ 52, Vzor 70, CZ75BΩ, CZ75D PCR Compact, CZ 75 P07 Duty, CZ75 SP-01 Phantom, CZ Shadow 2 Urban Grey, CZ P09 DUTY, P10C, CZ 82, CZ 83, CZ 97BE, CZ 2075BD RAMI, CZ 452 American. CZ 550 UCS (Urban Counter Sniper), CZ 805 Bren, DUO  & Z

Offline teckno

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Re: Cz 52 loose breech
« Reply #4 on: March 12, 2017, 10:48:30 AM »
I just checked my CZ52.  There is absolutely no play in the breech.

I don't know the prior history of my CZ52, but it looks like one roller is older than the other as they have slightly different internal IDs and show different (i.e. not uniform) wear.

Did you remove the recoil spring and check for play?

Offline rdcinhou

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Re: Cz 52 loose breech
« Reply #5 on: March 12, 2017, 05:01:05 PM »
I just checked my CZ52.  There is absolutely no play in the breech.

I don't know the prior history of my CZ52, but it looks like one roller is older than the other as they have slightly different internal IDs and show different (i.e. not uniform) wear.

Did you remove the recoil spring and check for play?

Yes...followed your suggested technique of removing the recoil spring, reinstalling the barrel and roller block assembly.  When holding the block in place (rollers locked) there is no axial movement in the barrel. There is a very slight radial movement off the axis at the barrel exit, but not enough to measure the gap with the tools that I have. Definitely does not show any movement at the breech.
« Last Edit: March 12, 2017, 05:02:49 PM by rdcinhou »
CZ 24, CZ 27, CZ 38, CZ 45, CZ 52, Vzor 70, CZ75BΩ, CZ75D PCR Compact, CZ 75 P07 Duty, CZ75 SP-01 Phantom, CZ Shadow 2 Urban Grey, CZ P09 DUTY, P10C, CZ 82, CZ 83, CZ 97BE, CZ 2075BD RAMI, CZ 452 American. CZ 550 UCS (Urban Counter Sniper), CZ 805 Bren, DUO  & Z

 

anything