The Aero Precision M4E1 Threaded 16″ 5.56 M4 Barreled AR-15 Upper Receiver is the perfect addition to your AR-15 build. The unique receiver forging blends seamlessly into the lightweight ATLAS S-ONE free float M-LOK handguard, giving you a sleek, billet look without the weight or cost. The barrel nut with taper lock mount allows for an incredibly rigid free floating rail, meaning your sights and lasers will be deflected less when shooting from the prone or supported position.
Note: Barreled Upper Assembly does not include bolt carrier group or charging handle.
The Aero Precision M4E1 Threaded 16″ 5.56 M4 Barreled AR-15 Upper Receiver is a top quality firearm that will provide reliable service for many years to come. Featuring a threaded barrel with a mil-spec phosphate coating, this upper receiver is designed for use with standard 5.56 ammunition. The ATLAS S-ONE free float M-LOK handguard provides a solid grip and reduced weight, while the integrated QD sling swivel sockets ensure you have a convenient place to mount your favorite accessories.
Take your AR-15 build to the next level with the Aero Precision M4E1 Threaded 16″ 5.56 M4 Barreled AR-15 Upper Receiver. Built on the popular Enhanced Series Upper Receiver, the M4E1 features a 16″ 41V50 chrome moly vanadium steel barrel with a 1:7 twist rate that is chambered for 5.56 NATO. The barrel is finished with a durable inky black salt bath nitride finish that is exceptionally corrosion resistant and does not negatively impact accuracy. Threaded 1/2×28, the barrel is ready to accept your favorite AR-15 muzzle brakes, compensators, or flash hiders, and even ships with the highly effective A2 style bird cage flash hider.