Is your superior trigger slowly reseting or sticky to reset after thousands of rounds and not performing as it once was when it was new? 
This means your return spring and/ or your connector is compromised. Your spring can lose force over time and should be replaced every 5000 rounds. Your connector will also lose is springiness over time, it can be adjusted but is a consumable part and eventually will need to be replaced. 
This repair kit will get you back to new with new springs in comp, edc or duty weight as well as a new connector and a bottle of gunbutter oil.