bolt knob upgrades
Timney CZ 455
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Timney CZ 455

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$142.99 $129.99
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Tech Guide:


Timney Sportsman Triggers feature a lightweight alloy housing and hardened steel working surfaces. They are lightweight, rugged and durable. The trigger pull is adjustable from 2 to 4 lbs and is adjustable for Sear Engagement, Overtravel and Pull weight. These triggers require the use of the original safety. Minor fitting may be required.

Since it was founded in 1946, Timney Triggers has built a reputation based on the quality of its products. Because of the precision machining and workmanship that goes into each Timney product they are The World's Finest Triggers.™ Each and every Timney Trigger is individually tested and calibrated by hand in the action it was designed for before it's delivered to the customer's door. 

CZ 452 and 455 Adjustment Instructions

CZ 455 and 452

Sear Engagement 
Sear engagement or creep is controlled by the screw pressing against the back of the trigger. The triggers pivot point is below the adjustment screw and as the screw is turned in clockwise the top of the trigger moves closer to the edge of the sear. The closer the sear and trigger get to the edge the less sear engagement you have and the less creep you feel in the trigger. It is important to make this adjustment very slowly. With the rifle cocked, turn the screw clockwise until the rifle fires; then turn it counter clockwise 1/16 of a turn using a .050 hex wrench. 

Pull weight 
Pull weight is controlled by the screw pressing against a pull weight spring. The pull weight spring in turn presses against the trigger. If you turn the screw clockwise the amount of spring pressure increases and so does the pull weight. If you turn the screw counter clockwise the pull weight drops lower. It is important that the pull weight is not adjusted below 1.5 lbs or slam fires can occur.

CZ 452 and 455 Adjustment Instructions

This is where I want you to file. Take a few thousandths of an inch off of this flat on the back of the trigger. Don’t change the angle of the flat but do increase it slightly. This will allow the safety to lift the sear completely off of the trigger so that when you pull it there’s no click.

CZ 455 and 452

Make sure the rifle is unloaded.

Cock the rifle.

The bottom screw is your sear engagement.

Using a .050 hex wrench I want you to slowly turn this screw clockwise until the rifle fires.

Now turn it counter clockwise one flat of the wrench or 1/16 of a turn.

A nylock dowel will hold the screw in place so that it doesn’t move.

The pull weight screw is adjusted by the top screw with the nut on it.

To adjust your pull weight you will loosen the nut and using a 5/64 hex wrench, turn the screw clockwise to increase the pull weight; or counter clockwise to decrease your pull weight.

The pull weight adjustment works by the screw pressing against a spring which in turn presses against the trigger. As you turn it clockwise (pushing the screw further into the housing) the screw compresses the spring and the pull weight goes up. AS you back out the screw (counter clockwise) the pull weight drops lower.

Be careful not to drop the pull weight too low or you will lose spring pressure and it will fire when the bolt is slammed.

Use a trigger pull gauge to measure the pull weight. It should not go below 2lbs.

CZ 455 and 452

Occasionally an issue with bolt stop not holding arises with the CZ 455 rifles. Generally this means that the sear on top of the Timney Trigger is too tall and is not resetting to the correct position after firing. To fix this issue you remove a few thousandths of an inch from the tip of the sear so that it can return to neutral of the full vertical position. Be sure to keep the angle flat and not follow the angles front and back as they each have a specific function.


Made in the USA


1 Review

  • Timney

    Posted by K johnson on Oct 27th 2018

    I bought this trigger hoping it would make my 455 trainer a better rifle. I put a yo dave kit in but no matter what the changes the factory trigger wasn’t working like I wanted it. So I purchased this. Now let me say that you need to take out material on the stock to install this trigger. It IS NOT a drop in trigger. The Manners stock had soft fiberglass material that dremmeled out easily. Once installed I took it out without adjusting it at 4# and blasted one big hole out of my target at 50yds. The trigger stable even at 4# was a huge improvement. The instructions say don’t adjust this trigger below 2#, while another place said don’t adjust below 1 1/2 #. Get this trigger!!! If u are timid about removing material send it to Timney and let them do it. Not too expensive!!

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