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, precision machined to work with all mil-spec AR15 parts and includes the port door and forward assist pre-installed for your convenience.
- New enhanced forging that gives the upper receiver a "billet look"
- New picatinny profile that blends seamlessly with Aero's Enhanced and ATLAS Series Handguards
- M4 Feedramps
- .250 takedown pin holes
- Includes threaded forward assist roll pin
- Includes port door and forward assist
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Solid Product, quick shipping, Will buy from you again
Best price I could find, super fast shipping, couldn’t ask for anything more.