AR15 Complete Alpha 7.5″ Upper – 5.56 Nato Upper Receiver : S2 Armament Forged Upper Receiver Forged 7075-T6 Aluminum Type 3 hard-coat anodized M4 feed ramps S2 Armament lasered dust cover, proudly displaying the US and AZ flags BARREL : S2 Armament Contract 7.5″ Government Profile Barrel 4150 Chrome Moly Vanadium steel Nitride Finish Nitride-coated…