OK, so first off thank you to Rick for taking me out the DRRC today to get the new AR test fired. Here's the problem. Every few rounds, the trigger wouldn't reset. The only way we could get the trigger to reset was to rack the bolt, and eject the round in the chamber. We took the upper off and tested the trigger and it worked fine. I pulled the trigger and trapped it back, hammer dropped, Rick reset the hammer, and we did again and again. Replaced the upper, and same thing. It would fire a couple rounds and then not reset. It got to the point were it failed reset after every fired round. The trigger is the Black Rain Ordnance drop in trigger, NOT a standard mil-spec. Anyone have any suggestions? Thanks!