Complete built upper receiver:
- M4 parkerized, 4150 chrome vanadium lined barrel, chambered in .223 wylde with a 1:7 twist
- Birdcage flash hider
- Carbine length gas system
- 13.5″ m-lok handguard
- Flat-top mil-spec Cerro 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.