TRYBE Defense AR-15 5.56x45mm NATO 16in Complete Upper Receiver Government Mid Length 1-7 Twist 1/2x28 A2 Black. 56x45mm NATO complete upper receiver assembly by TRYBE Defense is engineered around proven M4 architecture and modern free-float design principles to deliver consistent accuracy durability and modular compatibility. Built for the AR-15 platform it pairs a 4150 CMV M4-profile barrel with a rigid 15" free-float M-LOK handguard ensuring reliable performance under sustained fire while maintaining optimal weight distribution and handling. Designed to accommodate a wide range of ammunition optics and accessories this upper serves as a versatile foundation for duty training or general-purpose rifle builds. Versatile Performance Built for dependable performance and modularity this complete upper receiver assembly delivers reliable execution in a balanced duty-ready configuration. Designed around the M4 profile and modern free-float architecture it s an ideal solution for shooters who demand consistency across training defense and general-purpose use. Proper BCG recoil spring and buffer weight are necessary to ensure proper cycling. 16 4150 CMV M4 Profile Barrel The heart of this upper is a 16" M4-profile barrel machined from 4150 CMV steel a material trusted in military and hard-use rifles. Compared to 4140 steel 4150 CMV offers superior heat resistance and durability under sustained fire making it well-suited for high round counts and demanding shooting schedules. The M4 contour balances strength and weight maintaining rigidity where it matters while keeping the rifle agile. 1:7 Twist Rate Versatility The 1:7 twist rate allows reliable stabilization of a wide range of bullet weights including heavier 69 77gr projectiles commonly used for defensive duty and match applications. This makes the upper adaptable across ammunition types without compromising accuracy or terminal performance. Free-Float 15" M-LOK Handguard A 15-inch free-float M-LOK handguard maximizes usable rail space while eliminating barrel contact improving mechanical accuracy and consistency. The extended length supports modern shooting techniques enhances control and provides ample real estate for accessories such as lights grips and bipods without unnecessary bulk. Continuous Picatinny Rail The full-length top Picatinny rail ensures secure mounting of optics magnifiers backup iron sights and night vision or thermal devices. Precise alignment and repeatable mounting make this upper well-suited for both duty and recreational setups. Standard 1/2x28 Threading Standard 1/2x28 muzzle threads provide broad compatibility with flash hiders compensators muzzle brakes and suppressor mounts allowing users to configure the rifle to their specific mission or preference. Why the AR-15 Platform The AR-15 remains the most versatile rifle platform available offering unmatched modularity parts availability and ergonomic efficiency. This upper receiver takes full advantage of that ecosystem allowing shooters to tailor their rifle for home defense range use competition or professional applications with minimal effort. Performance-Driven Design. Quality Materials. Reliable Performance. This complete upper receiver is engineered to meet the expectations of serious AR-15 users who prioritize function longevity and adaptability in a single well-balanced assembly. This TRYBE Defense upper receiver is the perfect tool for any shooter serious about the performance of their AR-15 firearm. For high performance gun parts quality gear and innovative industry-leading optics check out the premium products offered at TRYBE Defense TRYBE Tactical and TRYBE Optics. JOIN. THE. TRYBE. Specifications for TRYBE Defense AR-15 Complete Upper Receiver 16in 5.56 Rifle Barrel M4 Profile: Manufacturer: TRYBE Defense Caliber: 5.56x45mm NATO Overall Length: 16 in Barrel Length: 16 in Barrel Twist Rate: 1-7 Threads per Inch: 1/2x28 Muzzle Device: A2 Color: Black Gun Model: AR-15 Fabric/Material: 7075-T6 Aluminum Gas Block Journal Size-Diameter: .750 in Handguard Length: 15 in Handguard Style: Hybrid Rail Gun Rail: M-LOK Gun Make: AR Platform Features of TRYBE Defense AR-15 Complete Upper Receiver 16in 5.56 Rifle Barrel M4 Profile 16'' 5.56x45mm M4 Profile 4150 CMV Steel Barrel 1/2x28 Thread Pitch M4 Feedramps 15'' Free Float Handguard M-LOK Positions: 90 /180 /270 QD Sling Socket at 3 and 9 O Clock Positions Continuous Top Picatinny Rail 100percent Made in the USA Package Contents: TRYBE Defense AR-15 Complete Upper Receiver 16in 5.56 Rifle Barrel M4 Profile 15 Free Float Handguard 16'' 5.56 Rifle Barrel Standard A2 Flash Hider Dust Cover Assembly Handguard Barrel Nut Mounting Screws TRYBE Warranty TRYBE products are made for performance and durability and are covered by a comprehensive warranty depending on the type of product. See full warranty information here What firearm models does the manufacturer say TRYBE Defense AR-15 Complete Upper Receiver 16in 5.56 Rifle Barrel M4 Profile