I built this AR as a fun truck gun. Has less than 30 rounds down range. Went with the lightest parts I could find.

aero precision upper and lower. ( blem set)
10.5 noveske 556 barrel and gas block
Dead air break
V7 titanium barrel nut and plate, trigger pins,
Larue trigger
Radian charge handle and safety switch
Battle arms bolt release.

The list goes on. If you want more info please feel free to DM.