CZ 455 Trigger

Model #

CZ $108.11

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.

Tech Guide Downloads

CZ 452 & 455 Adjustment Instructions.pdf
CZ 455 and 452.pdf
CZ 455 Bolt Stop Modification.pdf

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Description

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.

Tech Guide Downloads

CZ 452 & 455 Adjustment Instructions.pdf
CZ 455 and 452.pdf
CZ 455 Bolt Stop Modification.pdf

Reviews (2)

Write a review

CZ455 Trigger

Just received this Trigger last week. Factory preset to 2 lbs. It was a drop in install with no fitting required at all. Using a Lyman Digital gauge it broke at 2lbs ,4 times in a row. I'm very happy with this product and will be ordering for my other rifles.
Posted by Azhuff1 from Indiana on Jul 16th 2018

CZ 455


5 stars is undercutting the rating system drastically...10 stars would be more like it! I have Timneys on all of my rifles, the lastest being a CZ 455 varmint, and they are all the same...no travel, no creep, no over-travel just a perfect crisp, clean break every time...There are many components that go into delivering the maximum amount of accuracy you can squeeze out of your rifle, but a good trigger is a must. And these babies deliver! I couldn't be happier! There's nothing perfect in life...except Timney Triggers!
Shoot straight guys and gals!
Posted by   Charles Gauldin from VA on Jul 7th 2018

What Is Trigger Pull weight?

Pull weight is the amount of pressure, in ounces or pounds, required to fire the trigger. Or in other words, how hard you have to squeeze the trigger to shoot your rifle. Timney Trigger experts at our Phoenix, Arizona plant hand-test every trigger in its intended action and then set the pull weight at our factory standard, 3 lbs.

If you prefer a different pull weight you simply select it from the drop down above and your Timney Trigger will be customized to your preference.
The #1 reason to replace your factory trigger with a Timney is accuracy. A lighter, crisper, more consistent trigger pull will make you more accurate with your firearm.

Below is a guide for pull weight selection:

2-2.5 pounds
Light trigger pull weights are great for people shooting lighter weight rifles as they can help keep you on target during the shot. Also common weights for target shooting from a bench.

3-3.5 pounds
By far the most common trigger pull weights -this is great for virtually all applications including target shooting, hunting and 3-gun competitions.

4.0 pounds+
Heavy trigger pull weights are good for cold weather hunting or applications where you may be shooting with gloves on.

This trigger works with these rifles:

  • CZ 455

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