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Old 07-16-2021, 09:59 AM
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why do some bolt knobs



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have holes in em and others do not.
Is there a function of the hole I've missed reading a bazillion CZ threads?

No big deal on the looks other than a holy bolt is not this heathen's cup of tea. JMO YMMV ETC
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Old 07-16-2021, 10:01 AM
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Not sure why any from recent years wouldn't have them, but they are supposedly a gas vent to help prevent blow back into the shooter's face in the event of a ruptured case. EDIT: Sorry, this is for bolt bodies, not handles. I misread and was picturing bolt bodies (which long ago on the BRNOs, didn't have the gas vent holes, then evolved through a couple different hole configurations).

Last edited by I6turbo; 07-16-2021 at 10:38 AM.
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Old 07-16-2021, 10:16 AM
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Don't think the bolt handles are vented at least this is the first time I've seen that, Denny said then hole was to use with a fixture during manufacture but that wouldn't explain it coming, going and then returning. ??????
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Old 07-16-2021, 10:28 AM
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The ones with a hole in the knob are High Speed, Low Drag for those shooters who like to blaze away.......
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Old 07-16-2021, 10:36 AM
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Sorry, I misread and was thinking bolt bodies.
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Old 07-16-2021, 10:54 AM
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Sorry, I misread and was thinking bolt bodies.
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Old 07-16-2021, 12:13 PM
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Quote:
Originally Posted by Al the Infidel View Post
have holes in em and others do not.
Is there a function of the hole I've missed reading a bazillion CZ threads?

No big deal on the looks other than a holy bolt is not this heathen's cup of tea. JMO YMMV ETC
I have two B-series 455's in .22LR (Varmint 2012 year of manufacture, Training Rifle from 2015) with solid bolt handles and one C-Series (UltraLux from 2017) with a hollow bolt handle.

If saving weight was an issue, I have not been able to appreciate it.

If saving cost (?) was an issue, I CANNOT appreciate it.

Last edited by Squeezer; 07-16-2021 at 12:23 PM.
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Old 07-16-2021, 01:17 PM
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I have no use for the marble sized knob on either series, 55 or 57.

Bill
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Old 07-16-2021, 03:39 PM
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Just an FYI item. The Bergara bolt handles fit the CZ models as they both are threaded M6x1. Bergara knobs are available for ~$22 on the Bay with free shipping. I had a knob on backorder from DIP since 1/1/21 and got a bit frustrated. So, I bought the Bergara knob. Nice product and a very useful improvement IMO.
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Old 07-16-2021, 06:50 PM
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Absolutely no idea, never really gave it a thought to be honest, best guess it’s probably down to individual manufactures.

My 63 year old Brno has a hollow bolt knob, it works just fine. Happy days……
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Old 07-16-2021, 07:35 PM
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I like the gas vent concept

Some do some dont, different suppliers.

I suppose im obtuse, but i have no idea which version mine are, and “ frankly , my dear, I don’t give a hoot”
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Old 07-17-2021, 09:15 AM
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I was just curious and wondering what the responses might be while considering how some of y'all are jenuwine nit pickers about fine details, such as the shape of the trigger guard, FS plastic vs steel nose caps, poly vs steel magazines, poly/plastic parts, and other items of function and appearance.
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Old 07-17-2021, 09:41 AM
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I put a small rope thru the hole and wrapped around my wrist which makes it easier and faster to cycle the bolt in our fast paced longrange matches. In the flurry of action if you miss grabbing the knob just keep lifting and pulling back with your wrist and it will open the bolt. With a big open palm it's easy to slam the next one home. Horse hair works best, tried thin wire but nearly cut my wrist off.

They do have a purpose, it's been pretty much a secret to most till now.

Topstrap
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Old 07-17-2021, 09:55 AM
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Quote:
Originally Posted by Topstrap44 View Post
I put a small rope thru the hole and wrapped around my wrist which makes it easier and faster to cycle the bolt in our fast paced longrange matches. In the flurry of action if you miss grabbing the knob just keep lifting and pulling back with your wrist and it will open the bolt. With a big open palm it's easy to slam the next one home. Horse hair works best, tried thin wire but nearly cut my wrist off.

They do have a purpose, it's been pretty much a secret to most till now.

Topstrap
Come again.....my CZ bolt has no hole like an eye on a fish hook.
I need a picture....lol
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Old 07-17-2021, 10:11 AM
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Change mine for a area 419 bolt knob, no regret.
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