Cartridge: AKK_5.56 x 45 Contour: Heavy Finish: Black Nitride Gas System Length: 416 Length: 16'' Make: Brownells Make: Heckler & Koch Make/Model: Brownells|Brn-4 Make/Model: Heckler & Koch|HK416 Make/Model: Heckler & Koch|Mr556 Model: Brn-4 Model: HK416 Model: Mr556 Muzzle Threads: 1/2-28 Twist: 1-7
Manufacturer: Brownells Model:
Caliber: 5.56x45mm is a standard NATO caliber commonly used in AR-15 rifles.
Length: Barrels come in various lengths, such as 16 inches, 18 inches, or 20 inches, with shorter or longer options available.
Material: Barrels are typically made of materials like chrome-moly steel or stainless steel, and the choice can affect factors like weight and durability.
Twist Rate: The twist rate of the barrel's rifling affects the stabilization of the bullet in flight.
