- 11.5" Pre-Ban Heavy Profile Flat Top Barrel Assembly. Carbine Gas System.
- Includes: 11.5" 1X9 Twist, Heavy Profile, Chrome Moly Vanadium Barrel, Flat Top Upper With White, T-Marks & M4 Feed Ramps, HPT/MPI Tested Bolt And Carrier Assembly, Charging Handle, Carbine Handguard, Pistol Tube W/ Receiver End Plate & Castle Nut, Car Buffer Spring & H-Buffer. ***The Upper Is Assembled, Head Spaced, And Test Fired.