A little over five years ago I had to replace the trigger in an AR because it would sometime double. A month or so ago I had another AR double on me. I cleaned it and tried it again. Still, it sometimes doubled.
When I took it apart everything looked good. I couldn’t see significant wear like I did with the other trigger that went bad on me. Oh, well.
Last weekend I replace the trigger group with a Timney trigger. I should have read the comments to my previous post before ordering. I have really liked the several other Timney triggers in various guns and so I just ordered another and dropped it in.