The Single stage Trigger from the factory is so light it was hurting my accuracy so I got these M4X16mm Screws from Amazon and exchanged it with the old trigger stop their a little shorter then the factory screw but wok just fine they have a spring and a Ball bearing takes some cocking and firing to get it in the right distance from the trigger but it's worth it now I have a 2 stage trigger. Saw this on YouTube
