Ok, with the help of one of my hometown arfcom members I will be building my first AR at the end of October. This is what I have, or is on the way to the house, already:

Mega lower
CMT collapsable stock
CMT lower parts kit
Bushmaster 16' Patrolmans carbine barrel
an A4 flat top receiver w/feed ramps from Bravo Company


Things that I'm looking at to finish it off:

DD or YH free float w/rails
M16 bolt group
BUIS

What am I missing? Any suggestions or comments?

Sling
Aimpoint M3 with ARMS 22M68 candy lever mount.

I'm not a big fan of the YHM free float systems with rails.  I think the DD or La Rue would be a better choice.