but I'm already customizing it in my head. I think my first add-on will be new grips. I'm considering a Hogue rubber grip with the finger grooves and a left-handed thumbrest (yes, I know I shoot wrong-handed).
I ran with the Hogue rubber grip for a while, decided I liked the factory checkered plastic better.
First thing to do -- clean it, lube it and shoot it.
Any more, I'm not a fan of customizing before I'm very familiar with it from the factory. Too many people throw customizations on a new gun, creating new problems without solving old problems (or old non-problems).