Complete built upper receiver:
- Heavy 4150 chrome vanadium barrel, chambered in 5.56NATO with a 1:7 twist
- Birdcage flash hider
- Carbine length gas system
- 15″ m-lok handguard
- Flat-top mil-spec upper receiver with installed dust cover and forward assist
- No BCG or charging handle
Note: Barrel caliber may be 5.56 based on market availability.