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CZ550 Barrel/Action thread?

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04 July 2001, 15:48
McCray
CZ550 Barrel/Action thread?
Anybody know what the threads are on these actions? I'm assuming it's a metric pitch.
Thanks, Joe.
05 July 2001, 01:02
<Mats>
Something in the back of my head says M26x2, but I'm not sure... IIRC, there was a discussion on this very board not long ago - try the archives.

-- Mats

05 July 2001, 04:34
John Ricks
I think it is 27mm x2mm, I have one in the vault and will check and post later.
05 July 2001, 07:46
John Ricks
Just measured, it is 28mmx2mm, on the Magnum Length action.
06 July 2001, 10:28
McCray
Thanks, John. Brownells lists it as "28x2sp3" Now I need to dig out my change gears and see if the lathe can cut it.

Also, I put together a flush system using your photos and it worked great. Beats the wipe and dip deal in every way.

Thanks again, Joe.

06 July 2001, 11:41
John Ricks
You will need a 127 tooth transpose gear to cut metric threads on a American pitch lead screw. Check the gear chart on your lathe. What make & size is your lathe? I had to cut metric threads for 2 barrels last week.

Yep, the muzzle flush coolant system is great, I had to chamber 5 barrels last week. Would have been a pain with the old wipe & brush method! Plus you get a much better finish to the chamber. If you use water soluble oil, mix it very heavy.

[This message has been edited by John Ricks (edited 07-06-2001).]