My parts list.
Spikes Zombie lower
RR single stage LPK
Spikes T2 heavy buffer
Double star buffer tube and stock ( got real cheap)
Aero Precision stripped upper
Spikes Zombie dust cover
RR forward assist
Spikes charging handle
R guns Nickel Boron BCG
DD 5.56 NATO Government contour mid length barrel 1:7 twist 16"
Fish Bone Brake (eBay for cheap works and looks great)
YHM fold down gas block front sight.
RR mid length gas tube
forearm delta ring set ( free)
Mil spec rear sight
I think that is all. Lol.
Pic of the brake.