In my opinion the ultimate 0-600 yard fighting AR15 money can buy. KAC LPR Mod 1 (MLOK) ambi lower with:
PA Griffin MOA 1x8 Platinum on LEAP SCALARWORX mount
Trijicon RMR offset on Arisaka mount
KAC flip up irons
G&G FDE Gas busting Airborne charging handle
Magpul K2 grip
Magpul Slim...