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Timney Triggers - CZ Brno 455 Trigger

Product # 1118567
$239.99
Out of Stock

Product Description

MOF

Adjustable from 2-4lb

CZ 452 and 455 Adjustment Instructions

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.

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.

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.