WTS BRAND NEW, IN PACKAGE, FAST SHIPPING Tight bore 6.03mm barrel, 363mm length Features: Material: T-6 7075 Aircraft Grade Aluminum Diameter: 6.03mm Aircraft grade aluminum construction for enhanced durability 6.03mm diameter provides better seal around BB Increase range, accuracy, stability and consistency Designed to produce tighter groupings at range Weather resistant hard anodized finish When looking to increase the performance of your AEG, a tight bore inner barrel is one of the best places to start. Replacing your airsoft rifle's stock barrel with a tight with the Madbull Airsoft Black Python 6.03mm Inner Barrel will dramatically enhance your rifle's accuracy, range and consistency. Made with high strength aircraft-grade aluminum this barrel is specially coated to be extra smooth and withstand wear from BBs passing through the barrel.