Great spr upper - Aero Precision M4E1 AR-15 18in 5.56 Rifle Barrel Complete Upper Receiver with Flash Hider

The Ballistic Advantage SPR barrel in this Aero is excellent. With M855 62gr it's punching 1.2" groups on average at 100. I sure someone could do way better with a better optic. It's far more accurate then I am. I'm just Using a cheap 3x prism temporarily. For the price it punches way above it's weight. The hand guard is very round and just perfect for this setup. More ridged than the Atlas handguard and perfect platform for a LPVO or full size scope and bi-pod. I would highly recommend this upper.