20" aero upper - Aero Precision AR15 16in 5.56 Complete Upper Receiver with Flash Hider w/Magpul MOE Handguard

After several hundred rounds I am confident that this is a nicely build upper. I used an Aero phosphate BCG and standard charging handle with it. Accuracy is good and I have had no feeding issues with USGI, magpul, and lancer mags. The nitride treatment on the barrel looks nice and even. The only thing I wish this upper had was the front sling swivel. You have to get that and the pin separate for some reason.