I’m a big fan of these, and recently put on in my Aero EPC 9 build. It is their PCC trigger specifically made for AR9s and I have been having a lot of issues with it. At least once a mag the trigger would not reset and be completely dead. I reached out to CMC, and they were very responsive and quickly sent me a RMA form and a even a shipping label. Turnaround time was 1 week mail box to mail box, and when I opened the box today, I had my repaired trigger and a ton of swag.