Note: This barreled upper receiver assembly has a barrel length under 16” and is therefore subject to all NFA rules and regulations. Know your local laws before purchasing.
Aero Precision’s M4E1 Threaded AR-15 Barreled Upper Receiver comes completely assembled with a 14.5″ 5.56 barrel and their ATLAS R-ONE M-LOK handguard. This barreled upper receiver group does not include a BCG or charging handle, allowing you to choose your favorites for your build. The upper receiver is, however, fully assembled with forward assist and dust cover.