WOW I see I am just getting started. Sweet gun 
Actually, optics aside the only thing I have really done are the Magpul PRS stock and the ergo palm rest grip. I see you have the exact same rifle, that PRS balances out the barrel really well, and it's about a 5min install.
The optics were the biggest chunk of change I have put into it.
Timney trigger is in the mail, threading, muzzle break and barrel cerakote in probably 2 weeks or so and a year or so from now I can get a suppressor for it approved.