AERO Precision M4E1 Threaded Stripped Upper Receiver (Black) The M4E1 Threaded Upper Receiver features a new angular-machined design that sets it apart from standard mil-spec upper receivers. This upper receiver features the same enhanced body profile as our M4E1 Enhanced Upper Receiver but is threaded to accept a standard AR15 barrel nut. It is forged from 7075-T6 Aluminum and precision-machined to work with all mil-spec AR15 parts.

Aero Precision’s new Aero Precision M4E1 Threaded Upper Receiver (formerly known as the Gen 2 Upper receiver) gives you that angled billet look without the high cost or the fitment issues many builders experience when trying to mate a non-matching billet upper/lower receiver. Aero precision has machined this stripped upper to accept a standard AR-15 barrel nut and mil-spec upper parts (Forward Assist & Dust Cover not included). M4E1 Features: New enhanced forging that gives the upper receiver a “billet look” Includes Threaded Roll Pin for ease of forward assist installation. Features: