Trigger
The single set trigger on a CZ-550 operates as a single stage during normal operation. However, when it is desirable to have less trigger pull, such as for longer range or very accurate shooting, the trigger can be pushed forward, making it a set trigger. These rifles are factory set with the trigger pull set at approximately 15 N (3.4 lbf) in standard mode and approximately 7 N (1.6 lbf) in the set mode. Both settings are adjustable.
Read more about this topic: CZ 550, Design Details