I resently finished my first AR build, all considered I REALLY like it. OK so it's an AR15, but hey it's the first. To get to the trigger topic: my first trigger I installed was the ATC Gold trigger. The drop in - dropped in for the fitting and function check, worked perfectly. Then the addition of the saftey, all went well and the safety locked the trigger solid. Very pleased. Then released the safety to check the trigger and it would not move to the fire position. Removed the trigger again, started all over again, did all the checks again, it all went the same way. Next day the conversation with the tech at Brownells, it completely stumped him, trigger went back. Now have a JP trigger and I love this piece, I have another JP trigger for the 308 build.