- 5.56mm 10.5" 1/9 Barrel (also shoots .223 REM)
- 4150 Steel Machine Gun Rated Barrel
- Carbine Gas system
- Mil-Spec Flat top Upper Receiver with M4 Feed ramps (Made by Aero Precision)
- This upper is equipped with a carbine free float tactical rail system, threaded barrel with an A2 Flash hider!
- This Upper does not include BCG or Charging Handle