This is a new build that I just finished for my son in law that gave me my FNP 45 tactical. Its a Punisher Spikes lower, spikes lower parts kit, Spikes 5.56 16" upper, Magpul PRS stock. And then I put the streamlight flashlight for the cool factor on it. The optic is a 150 dollar 3x NCstar tactical with illuminated reticule