For what it may be worth...I had...an original Quad 400 (few years old). The trigger pull was horrendous.
Very long story short...it went back to Barnett "just reciently"...another long story short...all is well, long pull but it has been updated to "current" Quad 400 specs. and works well.
I made a small spacer to remove much of the unnessesary trigger movement. And, as has been noted, a little oil.
This all, has added up to be a good experience with Barnett and the care of at least BXB, the guy that answers the questions here.
Mike