Upper Receiver: A4 Flat-Top, Forged by, Sigma DTA Bear Creek or Anderson
Barrel Length: 16"
Barrel Contour: H-bar
Barrel Material: chrome moly 4140 steel
Muzzle Thread Pattern: 5/8x24
Barrel Finish: Black Nitride
Twist Rate: 1 in 8" twist
Chamber: 300 Blackout AAC
M4 Feed Ramps: Yes
Bolt Carrier: Optional
Charging Handle: Optional
Muzzle Device: A2 style Gas System Length: Carbine
Gas Block Diameter: 0.750"
Handguard: 10" Super Slim Keymod Handgaurd
Something to note: Blackout rounds burn off most of their powder within the first 6 inches of the barrel. That is why the best blackout barrels all have pistol length gas systems. As this is a carbine length gas system, using a lighter weight spring or buffer may be something that is needed for it to cycle correctly - especially with subsonic rounds.
Please note: If the listing says "in-stock" it means we have all of the items in stock. Our assembled upper receivers are made to order, and as such, it may take up to 10 business days for your order to be ready to ship out. If that is a problem, please email or call us to let us know!