Cmmg Barrel Sub Assembly 5.7x28mm 16.1in 4140cm Twist 1 9

The CMMG 57D400F Barrel Sub-Assembly MT in 5.7x28mm with a 16.10" 4140CM barrel delivers precise performance for rifle enthusiasts seeking a reliable, mid-length option that blends durability with versatile shooting capabilities. Crafted to 16.1 inches in length and featuring a 1:9 twist, this barrel sub-assembly is designed to stabilize a wide range of 5.7x28mm projectiles, supporting consistent accuracy across multiple ammunition brands and loadings. The 4140 chromoly steel construction provides robust strength and enduring barrel life, optimizing heat resistance and shot-to-shot repeatability during sessions at the range or in field testing scenarios. As a complete sub-assembly, it integrates smoothly into compatible receivers, reducing assembly time while maintaining tight tolerances for reliable chambering and reduced muzzle deviation. Whether upgrading a dedicated 5.7x28mm platform, building a precision-oriented firearm, or refining an existing setup, this CMMG component helps maximize ballistics, velocity consistency, and overall handling. Its proven design and engineering align with performance-minded shooters who demand dependable barrel performance, predictable dynamics, and a solid foundation for accurate, controlled fire.