This complete barrel assembly is designed for seamless integration with MCR rifles and upper receiver assemblies, delivering precision and reliability in every shot. Featuring a barrel extension with fixed headspace, it ensures consistent performance and durability. The assembly includes a robust gas block with a four-position regulator, allowing for quick adjustments to optimize function across various conditions. A high-quality piston system enhances efficiency, while the flash hider reduces muzzle signature for improved control. Finished with a secure dovetail cover, this barrel assembly is built for shooters who demand superior craftsmanship and performance. 5.56x45mm chamber, providing compatibility with a wide range of military and commercial ammunition for optimal versatility Length 16-1/4 inches, offering an extended option for greater stability or performance Heavy profile for sustained fire use, designed to perform reliably under prolonged shooting sessions The thread pitch is 1/2-28 TPI The twist rate is 1:7 right hand twist Mid-length gas system, optimizing cycling and reducing recoil for smooth operation 4-position adjustable regulator for fine-tuning the gas system, providing optimal cycling for different ammunition types Mag-phosphate finish, providing corrosion-resistance and enhancing durability This component works with MCR and Shrike 5.56 rifles and upper receiver assemblies, enhancing compatibility and functionality across platforms Made in USA, supporting domestic manufacturing and ensuring local production standards