Shadow Systems SS-6040-CA: The U526 is a purpose-built duty rifle engineered for shooters who value smooth recoil, consistency and long-term reliability. Its intermediate gas system and hybrid-profile, chrome-lined barrel work together to deliver a refined shooting impulse across a wide range of ammunition. Featuring a hybrid-profile, chrome-lined barrel; rigid handguard interface for stability under load. Proprietary components throughout the rifle, including the furniture, rail, trigger and controls, ensure cohesive, predictable performance from the first shot to the last. Specifications Type Rifle Action Semi Automatic Caliber/Gauge 5.56 NATO (5.56x45) Capacity 10 Twist 1:7" Sights No Sights Trigger Two Stage Safety Safety Selector SKU LNG-SHDW-SS6040CA Country of Manufacture License Requirement FFL Manufacturer Shadow Systems Mfg. Part Number SS-6040-CA UPC 810120317496 Barrel Length 16 Threaded Barrel Yes Condition New