Hop takes a look at the Aero M4E1 Pro series rifle is presented as Aero Precision's high-end "prestige project," aiming to compete with duty-grade ARs with its $2,000 MSRP. It features a fully ambidextrous lower, a new cold hammer-forged, chrome-lined barrel by Ballistic Advantage, and upgraded Mod 4 rails and a duty-grade BCG.