Wow toney so your lower came with it or had u gotten it from someone else that might have done it? Glad to help. It's pretty tedious gettin the trigger where I wanted it and grinding on it to get safety to engage. I think I installed the trigger & hammer and tried to get the safety to slip in like 6-8 times before I got it just right there.
Superior Arms lower receivers ALL come with the trigger creep adjustment screw. That's one of their selling points. They are good lowers for the money. At least for play...