Alright so the barrel and gas block are a given. And i'll go less the FSB
Yankee Hill Customizable Free Float Less Rails
Yankee Hill Forearm End Cap
Tactical Solutions 10/22 Barrel Compensator (Same threading and exit as an AR comp and looks badass) here's a link
LMT A3 Complete Less b/bc/k group Upper with T-marks (M4 feedramp if the barrel has it as an option)
Fluting on the barrel (again, if possible)
TD Vertical Grip with pressure switch option
That should cover it. Everyone seems to have different prices so if you could get a guesstimate that would be great.