Andro Corp AR-15 Complete Upper Features The Andro Corp Industries complete upper is chambered in 5.56 NATO and centers on an 8 inch barrel machined from chrome moly vanadium steel for strength and heat resistance under sustained firing. A 1 in 7 inch twist rate stabilizes a broad range of bullet weights giving builders flexibility in ammunition selection for their intended use. The barrel is threaded 1/2x28 ready to accept a muzzle device or suppressor mount without additional machining. This combination of barrel length and twist rate makes the upper well suited to compact AR pistol or SBR builds where maneuverability matters. An M-LOK handguard surrounds the barrel providing direct mounting points along the forend for lights lasers slings and foregrips without needing separate rail sections. This slim modular handguard keeps the upper lightweight while giving builders the flexibility to configure their accessories as needed. As a complete upper it arrives ready to mate with a compatible AR-15 lower simplifying the build process for shooters assembling a short-barreled platform. The Andro Corp Industries complete upper offers a solid foundation for a compact maneuverable 5.56 build. Andro Corp AR-15 Complete Upper Specifications Manufacturer: Andro Corp Caliber: 5.56 NATO Barrel Length: 8 Barrel Material: Chrome Moly Vanadium Twist Rate: 1:7 Handguards: M-LOK Thread Pattern: 1/2x28 Available At: GrabAGun