Spike's Tactical Upper, Fits AR Rifles, Black, Flat Top, Machined from a Mil-Spec 7075 T6 forging, with Forward Assist and Ejection Door installed SFT50M4 Spikes Tactical's mission is simple" Spikes strives to build the highest quality products and offer them at the best possible price to the consumer. It doesn't matter if you are simply a gun enthusiast" a competitive 3 gun shooter or a military or law enforcement professional" Spikes rifles will serve you well and won't let you down when it counts and Spikes guarantees it. This is the same high quality M4 Mil-Spec upper used on Spikes factory builds.