I did an inexpensive build.
During firing, the trigger does not reset every time (but it does reset most of the time). I have to pull the trigger again, then it resets.
I have approximately 150 rounds through it and I am thinking it has to do with the trigger spring.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT