This Aero Precision M4E1 16″ Carbine Upper Receiver, Complete comes completely assembled with 16” 5.56 barrel & the ATLAS R-ONE M-LOK handguard.
This barreled upper receiver group does not include a BCG or charging handle.
The upper receiver is fully assembled with forward assist & dust cover.
The M4E1 threaded upper is made from forged 7075-T6 aluminum with a billet machined look that matches the lower & handguard. The ATLAS R-ONE free float handguard is 15” and features a 1.3” inner diameter that surrounds the low-profile gas block & carbine-length gas tube.
- M4E1 threaded upper receiver
- Forged 7075-T6 aluminum
- Assembled forward assist & dust cover
- 15” ATLAS R-ONE M-LOK
- Hard-coat anodized
- 16” 5.56 NATO barrel
- Machined from Chrome Moly Vanadium
- Carbine-length gas system
- 1:7 twist rate
- Threaded 1/2×28
- A2 flash hider
- Salt Bath Nitride finished