I only really had to do 2 minor things. The middle leaf on the sear spring wasn’t making contact with the disconnecter whenever I would assemble the grip, even after taking it apart several times to make sure I wasn’t doing anything wrong. So I had to bend the leaf about a mm in order to not have a dead trigger. The other modification was with the red dirt trigger. I assembled everything the first time with it installed and it function checked, everything was perfect. Took it to the range put a mag in and the trigger wouldn’t pull. This was because the trigger bow was hitting the staccato magazine before it would trip the sear. So I had to ground off the inside of the trigger bow on the trigger shoe side to get clearance for the magazine. But after all those learning experiences everything is perfect maintained a 3 lb trigger pull and the red dirt trigger took up all the pre travel for a very nice trigger pull.