The 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. This unit also saves time by including the forward assist and dust cover pre-installed.
M4E1 Threaded Assembled Features:
- New enhanced forging that gives the upper receiver a “billet look”
- Pre-installed Forward Assist and Dust Cover
- M4 Feedramps
- .250 takedown pin holes
- Lazer engraved T-marks
- M4E1 Threaded Assembled Upper Receiver