I am getting ready to install the proper RRK in my second P01 with a defensive package to go to the full PRO package. I have found that I like the PRO version better as installed in my PCR and my first P01. I am removing the 85C trigger and 1485 disconnector and put them up for purchase or trade. But, thats's beside the point, I was just wondering about if anyone had left out the set screws for the heck of it and can report on if it works or not. Just saying it for the information....