Complete built upper receiver:
- 16″ heavy profile 4150 chrome vanadium lined barrel, chambered in 5.56 with a 1:7 twist
- Low profile gas block
- Carbine length gas system
- 15″ keymod handguard
- Flat-top mil-spec Cerro upper receiver with installed dust cover and forward assist
- No BCG or charging handle
Note: barrel twist may vary between 1:7 and 1:8 based on market availability.