Impact sticky first stage trigger

The reason why this is happening is due to a very slight chamfer which forms on the sear contact areas after some use.

When the trigger is set very crisp, these 2 slightly chamfered surfaces "catch up", and the first stage spring is not able to reset the trigger anymore.

When you turn in the set screw with the spring loaded ball bearing ever so slightly, the sear doesn't reach that area anymore when hitting the second stage, and the first stage is able to reset again.

The result is a little bit of a heavier second stage, but this is barely noticeable.