Threading a cz 527

firemn260 · Apr 16, 2020

I have a cz 527 American in 221 FB. Its got the sporter barrel and with handloads will shoot 1/2” groups all day. I have used it for stalking varmits and got to thinking it would be a cool rifle to suppress when ever my omega 300 gets paroled.

My question is, would it be possible to thread such a light barrel for 5/8x24 or even 1/2x24? Any suggestions for a reputable gun smith who would do the work?

Also wouldn’t want to compromise such a accurate rifle by hanging extra weight on the end of it.

Thanks

GunBum · Apr 16, 2020

Not sure what the muzzle diameter is...

For 1/2-28, you only need a barrel that is 0.550” at the muzzle. 0.500” for the threads, and minimum 0.050 additional for the shoulder. For 221 FB, 1/2-28 is enough. Same thread that is used on AR-15’s in .223/5.56

You need a bit under 0.700” for 5/8-24. 0.625” for the threads and the rest for the shoulder.

firemn260 · Apr 16, 2020

GunBum said:
Not sure what the muzzle diameter is...

For 1/2-28, you only need a barrel that is 0.550” at the muzzle. 0.500” for the threads, and minimum 0.050 additional for the shoulder. For 221 FB, 1/2-28 is enough. Same thread that is used on AR-15’s in .223/5.56

You need a bit under 0.700” for 5/8-24. 0.625” for the threads and the rest for the shoulder.

From what I could find the 223 barrel measures .570 at the muzzle. I would assume same barrel as the 221.

I will just have to pick up a 1/2-28 direct thread for the omega.

Thank you

dink · Apr 17, 2020

I can highly recommend triple river for doing the work....http://tripleriver.net. They threaded a CZ453 varmint barrel (17hmr) for me, and it's beautiful. You have to look real hard to even notice the thread protector they custom made for it. To top it off, they were actually cheaper (with shipping both ways) than any quotes I got around here.

Pinecone · Apr 17, 2020

I have used both Short Action Customs in Ohio (did a Rem 700 for me and installed muzzle brake), and Long Rifles Inc in Sturgis (did a Lilja barrel for my C455).

Both were one week door to door. LRI did the threading, made a thread protector (what when on, you cannot see the line), and Cerakoted the barrel. And still only 1 week door to door.

firemn260 · Apr 17, 2020

dink said:
I can highly recommend triple river for doing the work....http://tripleriver.net. They threaded a CZ453 varmint barrel (17hmr) for me, and it's beautiful. You have to look real hard to even notice the thread protector they custom made for it. To top it off, they were actually cheaper (with shipping both ways) than any quotes I got around here.

Pinecone said:
I have used both Short Action Customs in Ohio (did a Rem 700 for me and installed muzzle brake), and Long Rifles Inc in Sturgis (did a Lilja barrel for my C455).

Both were one week door to door. LRI did the threading, made a thread protector (what when on, you cannot see the line), and Cerakoted the barrel. And still only 1 week door to door.

Did you guys pull the barrel or did you send off the whole action?

rico903 · Apr 18, 2020

firemn260 said:
I have a cz 527 American in 221 FB. Its got the sporter barrel and with handloads will shoot 1/2” groups all day. I have used it for stalking varmits and got to thinking it would be a cool rifle to suppress when ever my omega 300 gets paroled.

My question is, would it be possible to thread such a light barrel for 5/8x24 or even 1/2x24? Any suggestions for a reputable gun smith who would do the work?

Also wouldn’t want to compromise such a accurate rifle by hanging extra weight on the end of it.

Thanks

Are you familiar with rimfire central.com? If not sign up and introduce yourself.. There is a whole forum dedicated to CZs with some excellent info. Post your question there for starters. Your post may get moved to the centerfire section but you'll get all the info you need to know.
It's all gun talk on the site.. No politics, water cooler etc. but excellent information and very helpful menberers.
I may be posting a similar question soon.

Pinecone · Apr 18, 2020

firemn260 said:
Did you guys pull the barrel or did you send off the whole action?

For my Rem 700, I sent the barreled action.

For the CZ, it was just the barrel.

You can send long guns FedEx Ground. So not expensive.

DutchV · Apr 18, 2020

I'd contact Morgan. Pretty much all he does is barrel threading. Prices and turnaround are good.

https://www.facebook.com/barrelthreading/

GunBum · Apr 18, 2020

Pinecone said:
For my Rem 700, I sent the barreled action.

For the CZ, it was just the barrel.

You can send long guns FedEx Ground. So not expensive.

You can send long guns USPS, UPS, FedEx... whatever you want.

firemn260 · Apr 18, 2020

My buddy has a barrel vice and he pulls r 700s all the time. I’ve just heard the cz barrels can be a pain to break loose. I tend to not be so gentle when I get frustrated so I’d rather just pay extra for someone more patient than me to take it off and put it back on.

dink · Apr 18, 2020

I sent the barreled action....

Threading a cz 527

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