The Aero Precision M4E1 assembled upper is a durable and reliable fit for your next AR-15 rifle build. It is compatible with all mil-spec parts. Get this upper today for the best price online from GrabAGun!
<p>M4E1 Assembled Upper Features The M4E1 Threaded Upper Receiver features a new angular machined design that helps it stand 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. M4E1 Assembled Upper Features Works with standard AR15 components Perfect for your custom AR15 build M4 Feedramps Includes threaded forward assist roll pin</p>
