How to improve barrel-slide fit?

[coolbox]

For standard non-accu bushing CZ75 variants, what options are available to improve barrel to slide fit?
Is there any oversized barrel bushing to replace factory bushing?
Further, how to improve fitting at chamber end (if possible)?

The idea is to improve accuracy further (sub 1.5" grouping in ransom test at 25yards) without any major modification or replacement (of barrel etc). The aim is to get accuracy similar to accu-bushing level without having to do the accu-bushing mod.

[NickS]

If I understand correctly the accu bushing had to be removable to fit as tight as it does and still allow the barrel to be removed. If you fitted a standard bushing to those tolerances you could not remove the barrel from the slide. I believe one of the real CZ masters; shmecky or EERW, has actually done a custom bushing and could not get the barrel out. I would say that you probably can't tighten up the muzzle end without an accu bushing or the equivalent.

As far as the chamber end, I suppose you could weld material then file to fit but i think welding would interfere with the heat treatment of the barrel and cause a potentially unsafe barrel. Lower temperature welding/soldering would be weaker I imagine and so not up to the task. I imagine the only cost effective way to do it would be to but an oversize barrel and fit it.

In any case it's probably cheaper to get an accu shadow.

[coolbox]

Interesting. I never thought about not being able to pull the barrel out with oversized bushing. I would like to keep the Accu shadow and oversized barrel out of the discussion for the time being.

[coolbox]

So, any suggestions here?

[Stuart]

What gun? Any particular cz pistol?

[coolbox]

TS 9mm
SP01 Shadow 9mm

[1SOW]

oops.  The scmecky thread I was 'remembering' was for a CZ 97 with a regular 45-type bbl bushing.
Delete this please.

[trgt]

The idea is to improve accuracy further (sub 1.5" grouping in ransom test at 25yards) without any major modification or replacement (of barrel etc). The aim is to get accuracy similar to accu-bushing level without having to do the accu-bushing mod.

I'll see if I can find it, I thought I read an article/review that basically stated that the factory CZ75 fitting is good, but still a lot of slop as a service grade weapon. You'd pick up a substantial amount of accuracy fitting a match barrel to the slide. That is the jist of what I remember, I'll go look for it.

[coolbox]

@trgt
Thanks. will look forward to it.
I would have so very hoped for the experts to chime in here too.

[Stuart]

generally the way to pick up accuracy is to make a way for the barrel to return to the same place in battery everytime consistently.
Historically that has been oversized frame and slide rails fitted and oversize barrels fitted.

so your contact points will be the slide/frame rails.
the top barrel lugs, the bottom barrel lugs,
the rear of barrel to breechface fit
and the OD barrel fit to ID bushing.

so if we remove oversize barrels and the ACCU bushing out of the equation of accomplishing this. what is left.
the bushing as now from the factory is fit loose to allow rotation of it to allow removal. that is why the ACCU is removeable. otherwise the barrel would stay in the slide.

the way the barrels are fit, the peanut does allow the barrel to be pushed up and the barrel lockup is fairly consistent. from a factory barrel you still do get a little back and forth play and side to side wiggle as the lower lug sits a little loose in the frame and the breech side of barrel can be a little short.

[coolbox]

Stuart

Thank you for the detailed reply.
I guess it is either an accu bushing, or a oversized match barrel fitted to the gun.

[Bossgobbler]

Let us know if you find a oversized match barrel.  As I have never heard of anyone making them for CZ's

[Stuart]

Let us know if you find a oversized match barrel.  As I have never heard of anyone making them for CZ's

we are trying to get some done, we sold out of the last batch of oversized threaded barrels we had.

BarSto used to make them, every now and then you can find one, KKM was rumored to be getting ready make them
I have heard that the Briley P9 barrel could be made to fit. but do not know for sure. Used the barrel in my P9 , many moons ago, but do not know if it translates to the CZ.

[1SOW]

Something scmecky posted a few years ago:  The slide moves and must have some movement slack side-to-side.  The slide doesn't really start moving until the bullet is virtually out of the bbl.,  but doesn't realign precisely every cycle.
The frame does not require movement slack and never changes alignment with the barrel bushing.    If the bbl locks to the frame tight and the bushing doesn't allow excessive side-to-side muzzle movement accuracy is improved.  A custom barrel  fitted to the bushing OR a bushing custom fitted to the barrel should limit the lock-up postion variations.

[coolbox]

It will be impossible for me to get hands on a barrel. I am 'overseas'..

Then I guess we are only left with over-sized bushings, Accu style or 1911 style. Now, I have to search for sources for bushing and necessary parts, as well as machining instructions (read: forget accurizing!)

BUT, I do wish all the best to those who intend to use the match barrels or accu-bushings.