Depends on age of your xs20. Older version had a good copy of the rekord trigger and adjusted the same. Newer version is the same trigger as a lot of other Chinese guns. What tends to happen is to rid it of creep people fit a longer adjustment screw which can make the sear barely engage. Start by backing this scew off (anti clockwise) to give sear more contact. This can be done with the gun in the stock, it's the only adjustment screw you will see.