They are fun, especially suppressed, I have the same gun.
I would remove the mag disconnect saftey, you buy and swap hammer bushings.
I deactivated my LCI by removing the metal tab that actuated it. This helped reliability for me. Some people buy a filler piece, I just left the plastic factory part there, it just doesn't move now.
A Volquartzen sear made a HUGE difference in the trigger pull, good enough for me and only $30-40. I have thought about trying one of Tandemkross' replacement triggers, but haven't yet.
You can buy a Fiber Optic front sight or maybe both for these, make sure the front sight is LITR specific though.
I liked thicker grips on mine than what it came with, but that's all up to you!
I polished the feed ramp a little, and hit any other rough spots. Not sure how much it helped but it runs really well on most ammo. They seem to be a little picky on the flatnose HP ammo.
ETA, I forgot one, if you have any extraction problems, just buy a replacement extractor from Tandemkross, VQ, Tacitical Solutions, Etc. I used Tac Sol on my rugers and basically eliminated extraction issues.